9 Best Water Purifiers in India (2021) – Buyer’s Guide & Reviews!

Are you looking for the best water purifier for your home?

Well, you have come to the correct place.

These days, installing a water purifier has become essential for every home. Misuse of water bodies, Industrial growth, Increasing population, and environmental degradation has polluted the water.

The main reason why we use a water purifier is to provide our family with 100% Safe and Mineral-rich drinking water and to prevent waterborne diseases.

RO or Reverse Osmosis is the most commonly used water purification in India, suitable for all kinds of water sources like Borewells, River water, or Municipality Supplied water.

RO is a very Robust technology that can purify the most contaminated, even salty water in just one go.

RO Water Purifiers that come with a combination of UV, UF, and MF filters can remove all sorts of impurities like Mud, Sand, Bacteria, Viruses, Cysts, and dissolved salts like calcium, magnesium, potassium and hard metals like lead and arsenic, etc.

You have to be very careful while selecting an RO water purifier because, along with removing contaminants, it is equally important to maintain a good amount of vital minerals like calcium, potassium, magnesium in the water.

The most important thing you have to concentrate on when selecting a water purifier is TDS.

Please don’t get confused.. we will explain in a detailed way.

TDS means “Total Dissolved Solids,” which is the measure of dissolved minerals, salts, metals and impurities in the water.

According to the Bureau of Indian Standards, water upto 500 ppm is safe for human consumption.

The ideal Range of TDS is between 100 and 300ppm. TDS between 300 to 500 ppm is also acceptable.

If the TDS is above 500 ppm, it means the water is Hard and not fit for Drinking.

TDS range below 100 ppm is not ideal as it is devoid of most minerals.

Before ordering a water purifier, the first thing you should do is to find the TDS levels in your water source.

It is very easy to measure the TDS in water; You can purchase a TDS meter for ₹150 or ₹200. Just take a glass of water and insert the TDS meter into it, and it will show you the reading.

If the TDS level is below 500ppm, there is no need to buy an RO water purifier; you can install a UV UF water purifier. If the TDS Levels are more than 500ppm, you need to get an RO UV water purifier.

With so many brands in the market and declaring that their purification technology is best, it gets confusing to choose the right water purifier.

You might get frustrated by various marketing terms like RO, UV, UF, TDS, Cooper RO, Mineral Booster, Mineralizer… But not anymore

This post will explain all the latest water purification technologies in a simple and detailed way.

Which is the Best Water Purifier in India?

Every month we spend hundreds of hours researching and testing the popular RO water purifier models to put forward the list of the top 10 RO water purifiers that are Perfectly suitable for All Indian homes.

Our Research includes Testing popular water purifier models by inputting both Groundwater and Municipality supplied water, Contacting hundreds of real users using the particular models, listening to their feedback, taking to customer care, and evaluating their support quality. We also consider Annual Maintenance Cost.

We have been reviewing water purifiers since 2016, and we have answered more than 700 questions in the comments section. This page has helped thousands of customers to make an informed decision to select the ideal water purifier for their home.

Best Water Purifiers in India 2021

1. KENT Supreme Extra

Best Selling RO Water Purifier in India With Zero Water Wastage, but there is a catch.

Key Features 

  • 7 Stage Water Purification With RO + UV + UF + Alkaline + TDS Controller
  • Zero Water Wastage
  • Storage Capacity is 8 Litres, and Water Purification Capacity is 20L/Hr
  • In-Tank UV LED for keeping water pure for longer periods
  • TDS Controller for adjusting the TDS level of output water.
  • Suitable for All Kinds of water sources Municipality, Tap, salty water.
  • Excellent Build Quality with Push-fit Components for Leak-Proof Performance.
  • Filter Change and UV Fail Alarms
  • 1 Year Warranty on the Product Plus 3 Years no service charge
  • The annual Maintenance cost is around ₹3000

Why we Recommend Kent Supreme extra

We have been testing Kent RO water purifiers since 2016. Previous models like Kent Pearl, Kent Grand have a faulty design. The components are not tightly packed in those models, so many users complained about cockroaches entering the machine.

Over the years, the design has improved a lot. The Kent Supreme extra comes with a Food Grade Plastic Body, and the components are push-fit which means the purifier is leak-proof.

Coming to the Purification Process, this Kent model comes with a 7 Stage purification process That Includes treatment of the water by Reverse Osmosis, Ultraviolet Bulb, and UF (UltraFiltration) Chambers.

This Model is suitable for all kinds of water sources like Borewells, Overhead tank water, river water, or municipality-supplied tap water. This Kent RO model can even purify water having TDS levels up to 2000 ppm.

Most of the Local RO water purifiers remove all the essential natural minerals from the water along with impurities, and drinking such low TDS water deprived of minerals is not Goof for health.

Unline Local RO Models, Kent Supreme extra comes with a TDS controller that allows for the retention of natural minerals so you can enjoy safe and tasty drinking water.

This Mineral RO Technology is simple. After the pre-filtration, a portion of the input water will be directly sent to UF Chamber, and it will not pass through the RO Membrane. In the final stages, both the water will be mixed and sent to UV Chamber. This is done to retain the natural minerals in the water. 

The best thing is, during installation, you can adjust the TDS Controller to set the Desired TDS Level for the output water. It is better if you keep this level around 250-300ppm.

Another Good feature in Kent Supreme extra is In-Tank UV Disinfection. There is a UV Bulb in the storage tank, and there is no chance for bacterial growth, and the water stored in the tank can be used for longer durations safely.

The Storage tank can safely store 8 Litres of water at once, and this Model can purify up to 20 Litres of water in an hour. This model is perfectly suitable for Medium size Indian families. Even if there are frequent power cuts, there will be enough water left in the storage tank.

The Annual Maintenace cost will be around ₹3000. It depends on the input water source and usage. If your input water has excessive TDS levels above 1500ppm, maintenance will be a little bit higher. Otherwise, it is around Rs 3000 per year. 

Why is it Good?

  • Kent Supreme extra is Fully Automatic and comes with Filter change and UV Fail Alarms that alert you when there is a need to change the filter. The Water purifier will stop automatically if you don’t change the filter.
  • The Zero water wastage technology in Kent Supreme is actually Good, but it is not for everyone. 
  • Zero wastage is achieved by re-circulating the RO reject water into the overhead tank using its own pump. The Reject water pipe will be left in a washbasin or a bucket for other water purifier models.
  • If you have an Individual house, you can set up this re-circulation connection to the overhead tank to avoid water wastage. It will not be possible if you live in an apartment complex. In such cases, you can use the drain water for washing or cleaning purposes.

What are the drawbacks?

  • For People who don’t have their overhead storage tank, zero water wastage is not possible.
  • This Model is priced a little bit on the higher side.
  • Alkaline water Term is also a Marketing Gimmick.

If your water source has TDS levels above 400 or 500ppm and you are looking for an RO water purifier with Good Build Quality and excellent purification with mineral-rich water, Kent Supreme is the right choice.

HUL Pureit Copper+ Mineral RO

Best RO Water Purifier With Precise Copper Dosing.

Key Features 

  • RO Purified water with Goodness of Copper
  • 7 Stage Purification Process with Sediment Filter, Carbon Filter, RO, UV, Post-RO Carbon Filter and Micro Filter membrane.
  • Suitable for All Kinds of Water Sources Like Borewells, Overhead Tank water, Taps,
  • Brackish water having TDS levels up to 2000 mg/lit.
  • 8 Litre Storage tank is Good for Medium Size family
  • The purification capacity is 28 litres per hour.
  • Two Soft Touch buttons for Dispensing RO water and Copper Charged RO water separately.
  • Digital Display panel with Tank Full and Filter Change LED Indicators.
  • One year Warranty on the Product
  • The annual Maintenance cost is around ₹4000

Now, More water purifier brands are offering copper-rich water, and all of them are not Good.

Drinking water from a copper vessel is an ancient and well established Indian tradition based on Ayurvedic Science. Copper has many added health benefits; a proper amount of Copper in water can improve digestion, aids weight loss, and good for immunity.

During these pandemic times, everyone is looking for immunity, and this is why most of the brands started offering Copper in the Purified water.

Like everything else, excess of Copper in water is also not good for health, and This is why we do not recommend water purifiers that come with a copper storage tank.

Just 2 or 3 Glasses of copper-enriched water per day is more than enough to avail the benefits of Copper.

Why do we recommend Pureit Copper+ RO Water Purifier?

Unlike the models with copper storage, Pureit Copper+ charges RO water with Copper in Real-time while dispensing the water; this is done with the help of a Unique technology called “electrochemical dissolution of Copper in water.”

This technology also ensures you get precise dosing and the right amount of Copper in every glass.

The best thing about Pureit Copper+ is, this water purifier comes with Dual water dispensing option, and you always have the choice to choose RO water, or Copper Charged RO water.

There are two soft-touch buttons; one for dispensing Copper charged RO water and the other for dispensing normal RO water.

There is a hidden drawback for Water purifiers with Touch Controls. The touch controls will not work if there is a power cut, and you can not dispense water even if there is enough water present in the storage tank.

We have been sending feedbacks to all the water purifier brands regarding this, and HUL has considered this aspect. Along with soft-touch controls, you can also install a Manual Tap for this water purifier.

The Tap lets you dispense Normal RO water even when there is no electricity. Please note that this water purifier can dispense Copper charged RO water only when there is electricity as the Copper is infused into the water in real-time.

Installing the Tap is necessary for most of us because there will be frequent power cuts, especially during the summer. If you have an inverter backup or don’t have power cuts, there is no need to install the Tap.

Another common issue with Copper Vessels or Copper Storage based water purifiers is, they require frequent cleaning using salt, lemon, vinegar or tamarind paste to avoid oxidation. As Pureit Copper+ RO adds the Copper to the water in real-time and does not sport a copper storage tank, there is no need to clean the storage tank.

Why is it Good?

  • Along with the Added benefits of Copper in the water, the HUL Pureit Copper+ RO water purifier does the job of a Traditional RO water purifier. Like the Kent Supreme model mentioned above, This Pureit model also comes with a TDS Modulator/Controller to retain the natural minerals in the water.
  • This Pureit RO comes with a big Storage tank that can hold 8 Litres of purified drinking water. This RO is capable of purifying up to 28 Litres of water in one hour and is perfectly suited for a family of 4 to 6 members. However, the purification capacity depends on external factors like water quality, TDS levels, the life of filters and input water pressure.
  • Pureit Copper+ RO not only gives you Safe drinking water but also looks Ultra Modern. The Black and Copper Color combination looks attractive, and you can either place this water purifier on a Table or Wall Mount it.
  • The functioning of the Soft Touch buttons is also good. You dont have to press and hold the button to dispense the water. With one touch, this water purifier can dispense the water continuously for 3 minutes. You can stop water dispensing whenever you want by again pressing the button.
  • This water purifier will alert 15 days in advance if there is a need to change the filter.

What are the drawbacks?

  • This HUL water purifier is Priced on the higher side.
  • In the absence of electricity, there is no option to dispense Copper charged RO water; you only get normal RO water.

Points to note

If your input water pressure is less than 10 PSI, you have to install a pressure enhancing pump for this model.

Also, If there is excess TDS above 1000ppm in your water, it is better to install an antiscalant as it will improve the lifespan of the RO membrane.

If Budget is not your concern, the Pureit Copper+ RO is the best RO water purifier for your Home. Along with Stylish looks, you get the right amount of minerals in your drinking water.

Water Purifier Buying Guide

Why do you need a water purifier?

You have hit the nail right on the head by asking this question. The water that is available in our taps is not exactly the best one to drink directly.

This water contains all kinds of contaminants one can imagine. It explains why many people boil water before drinking.

Boiling kills the germs, viruses, and bacteria from the water. At the same time, it kills the taste and flavour, as well but does not remove the salts from the water.

Therefore, one can resort to using water purifiers that can deliver high-quality drinking water that surprisingly, tastes good, as well.

Now the ‘Why’ part of the question is out of the way. Let us now concentrate on what to do before purchasing your water purifier.

Test the tap water

Of course, there are two ways of testing the tap water. One is to use your natural instincts, and the other is a scientific way with the use of a TDS meter or what we refer to as a water testing kit.

The natural way is to smell and taste the water. If it smells or tastes awful, you should go ahead and read the rest of the article.

At the same time, if it smells and tastes good, what should you do? You should still go ahead and read the article thoroughly.

Water that smells and tastes good is not necessarily the healthiest to drink.

Tap water in India contains soluble and insoluble impurities. Despite the municipalities purifying groundwater, the water can pick up contaminants on its way to your home.

It has to pass through pipes and tanks. Pipelines and tanks can be corroded. They can also have a mineral build-up. Both of these factors affect the quality of water.

Secondly, groundwater can have impurities like arsenic, antimony, lead, and so on. It can also contain Totally Dissolved Solids (TDS – we will be using this term frequently throughout the article).

TDS can comprise organic and inorganic salts including calcium, magnesium, potassium, chlorides, bicarbonates, and sulphates. Thus, it is good to use a TDS meter to determine the extent of TDS.

Where can you test the water?

You do not have to go to a laboratory to conduct the test. The TDS meter is a simple tool to use. It gives reasonably accurate results that should enable you to decide the type of water purifier you should have in your home.

How do you use the TDS meter?

A digital TDS meter should not cost more than a few hundred rupees. Invest in one, as it will prove useful to you for life. Here is how you use the TDS meter.

Step 1 – Determine the temperature of water in the following way

  • Switch on the TDS meter and press the TEMP button.
  • Place the meter inside the glass of water and note down its temperature.
  • Return to the TDS mode by pressing the TEMP button again.

Step 2 – Measure the TDS level

  • Remove the protective cap of the TDS meter and turn the TDS meter on.
  • Immerse the TDS meter in the glass of water up to the maximum immersion level marked on the device.
  • If there are any bubbles in the water, stir it gently to get rid of them.
  • Wait for about 10 seconds and allow the reading to stabilise.
  • Press the HOLD option and remove the device to note down the reading.

Now, you have the reading. What should you do now? This table will give you a good idea about what the reading conveys.

TDS Level Reasons for acceptability or Non-acceptance
Less than 50 Water with such a low level of TDS does not contain any essential minerals. It will be tasteless. It is not an acceptable range.
50 to 150 It is an acceptable level. However, if you have an RO water purifier at home, ensure that the TDS level is not below 80
150 to 200 This level is acceptable. Hospitals usually have this level of TDS in their water supply. It is ideal for maintaining cardiovascular fitness
250 to 350 Most of the Indian homes have tap water in this range. It is an acceptable range
350 to 500 BIS guidelines state that TDS levels up to 500 are acceptable.
500 to 900 As this level is not acceptable, use an RO water purifier with TDS controller/mineraliser.
900 to 1200 It is better to use an RO water purifier of good quality with TDS controller.
1200 to 2000 It is a highly unacceptable range. You will need an excellent RO water purifier that can handle water with TDS levels up to 2000.
Above 2000 Most of the RO water purifiers in the market cannot handle such a high level of TDS.

We shall now look at the type of water purifier you should buy depending on the TDS level in the source water.

TDS Level Water Quality Viruses/Bacteria Ideal water purifier
Below 500 Good Yes UV water purifier should be sufficient
Below 500 Muddy/turbid Yes Go for a UV + UF water purifier
Above 500 Good Yes RO + UV water purifier with TDS controller/mineraliser should be okay
Above 500 Muddy/turbid Yes RO + UV + UF water purifier with mineraliser/TDS controller should be ideal
Above 2000 NA NA Unfit for domestic consumption

You have done your homework correctly. Now, you know the TDS level as well as the water quality.

You should go ahead and purchase the ideal water purifier. Let us now discuss what these specific terms, TDS, UV, UF, RO, and so on signify. It will help you understand the basics well.

TDS – Totally Dissolved Solids

TDS can come in various forms. We shall now segregate our population into three distinct types

Rural Population

People living in villages and relying on natural sources of water

Village folk usually do not get piped water supply from municipalities. They rely on natural sources of water such as wells, borewells, rivers, and lakes.

These people use well water to cater to all requirements, domestic and agricultural.

If you venture into a village, you will find domestic animals like cows, buffaloes, goats, and dogs sharing the well water with humans. Naturally, there can be high levels of contaminants.

Secondly, industries in the vicinity of the villages dump their toxic wastes into the rivers and lakes.

The groundwater resources also get polluted due to the indiscriminate release of harmful metals like lead, arsenic, mercury, and so on. All these impurities, visible and impurities constitute TDS.

However, one should note that not all TDS is bad. The groundwater contains useful minerals like calcium, magnesium, and potassium, but the harmful TDS makes it necessary for village folk to invest in a good-quality RO water purifier and with a TDS controller.

We shall look into this aspect when we discuss RO water purification.

Urban Population

Those having access to piped water supply from municipalities

From the rural folk, we move towards the urban population that depends on municipal water supply. Many people have borewells in their homes.

Such people have an advantage over the rural people because the municipality undertakes the job of purification of water before distributing them to the residents through pipes (underground or over the ground).

Municipalities use RO water purification techniques to eliminate TDS and other contaminants. However, the RO-purified water collects impurities during transit from the municipal tanks to the homes.

Usually, the pipes supplying water to the residents are subject to corrosion, leaks, and rusting. Therefore, these households get water with visible impurities.

A UF and UV water purifier should be enough to purify the water, as the municipality has already taken care of RO.

Homes depending on borewells should determine the TDS levels before choosing the type of water purifier. It is always better to go for RO + UV + UF water purifier to be safe on all counts.

Coastal population

India has a vast coastal area with millions of people depending on salty groundwater for their consumption needs.

This water has a high level of TDS. Therefore, they should prefer the RO + UV + UV water purifier with TDS controller or mineraliser for domestic consumption.

We shall now discuss the different types of water filtering methods such as UV, UF, and RO. The concept should be clear before you decide to purchase the water purifier of your choice.

Different Types of Water Purification Systems

Gravity-based water purification systems

Old-timers will recall the simple water filter that used to be common in all households. It used to consist of two containers placed one over the other.

The top container used to have water filtering candles. One used to fill this container with the source water. The water seeps through the fine holes present in the filtering candles into the container below.

This water purification system is an example of gravity-based water purification. It is a kind of UF process. UF stands for Ultra Filtration.

The modern-day UF filters have such a membrane that can trap visible as well as ultrafine contaminants to provide water of good quality.

Such water filters are best in areas where the TDS levels are less than 500. Such water purification systems do not require any electricity for its functioning.

Ultra-Violet Chamber water purification water systems

About 30 years back, there were no RO water purifiers in India. People used to rely on the UF process for their water purification.

The turn of the twenty-first century saw the introduction of ultraviolet (UV) chambers as an effective method of water purification. UV purification is an effective method, as it can eliminate harmful viruses and bacteria.

The water passes through a UV chamber that serves its purpose by killing the germs and providing healthy water to drink.

Such water purification systems need electricity to work. Secondly, there is a disadvantage because the UV chamber can kill the germs but not destroy the bodies of the viruses and bacteria.

Of course, that should not affect your health in any way. However, it is better to pass such water through a UF membrane to remove the remnants.

Reverse Osmosis – RO water purifier

To understand Reverse Osmosis, one should be conversant with the principles of osmosis.

This requires us to go back to our school days and reopen the biology books. Osmosis is a natural process where a liquid in an area with a lower concentration tends to move towards an area of higher concentration through a semipermeable membrane.

A simple example of osmosis is when you place a potato inside a glass of water. After some time you will find the vegetable swelling up because the water from the glass seeps through inside the potato.

Source: puretecwater.com

The potato contains a high concentration of starch. The potato skin acts as a semipermeable membrane. The significance of the semipermeable membrane is that it does not allow the reverse flow of water under normal circumstances.

Reverse osmosis is reversing the process of osmosis. In this process, water moves from an area of higher concentration to that of a lower concentration through a semipermeable membrane.

RO water purifiers work on a similar procedure where the impure water with a higher TDS level passes through a semipermeable RO membrane.

The membrane has millions of small pores through which the salts cannot pass through. The water molecules are small enough to seep through thereby ensuring the elimination of TDS.

However, this process requires the application of pressure. Hence, RO water purifiers come with built-in pumps to quicken the process.

We shall now discuss the working principle of an RO water purifier.

RO Water Purifier – Working principle

The RO water purifiers available in the market employ a six-level or seven-level water filtration process.

Sediment Filter

The sediment filter is the first line of defence in an RO water purifier. Usually, the sediment filter is placed outside the RO water purifier machine.

The sediment filter works in a way similar to that of the erstwhile candle filters we had in the late 1980s. The water from the source passes through this sediment filter that takes care of the large impurities.

Hence the water loses much of its turbidity before entering the RO water purifier. It serves a dual purpose. On the one hand, it eliminates the heavy impurities and reduces the load for the RO water purification process. As a result, it enhances the life of the RO membrane.

Pre-Activated Carbon Filter

 The RO water purifier system has the water passing through an activated carbon filter to remove the organic impurities. This filter also helps by removing the unpleasant taste of water.

Ultra-Filtration Stage

The UF is the third stage of filtration. The water now passed through the UF membrane to trap soluble contaminants.

The UF membrane consists of tiny pores that can trap microscopic pollutants. Thus, the water becomes relatively free of soluble solids after passing through the UF stage.

Reverse Osmosis Stage

The RO purification is the crucial stage in the purification process. The UF-purified water passes through the RO membrane, thereby resulting in the elimination of all TDS.

This purification process removes the toxic molecules of lead, arsenic, mercury, and other contaminants. It also ensures to remove TDS by more than 99%. Thus, you have TDS-free water emerging from the outlet.

The RO process has a disadvantage in that it wastes a lot of water while squeezing out pure water from the water source. This water flows out of the machine through a separate outlet.

Ultraviolet Purification

The RO process takes care of TDS and other metallic impurities. It also destroys some of the larger microorganisms, as well.

However, organisms having size less than the pores of the RO membrane pass through the filtration process. This RO-purified water then passes through an ultraviolet chamber that destroys the viruses and bacteria from the water.

Hence, you have pure and healthy water at the end of the fifth stage of purification.

Post-activated carbon filter

The UV process eliminates viruses and bacteria by killing them. However, it cannot dispose of the dead bodies of these viruses. Secondly, some organic impurities manage to sneak through the process.

Hence, the water passes through a Post-activated filter to remove these dead bodies and improve the taste of water by getting rid of the organic pollutants. The primary function of this filter is to destroy the bad odour from the RO purified water.

TDS Controller – Mineraliser

As explained earlier, the RO purified water has low levels of TDS. In the process, the water loses essential salts like calcium, potassium, and magnesium, among others.

The TDS controller replenishes these salts and balances the pH level of water. We have discussed that pure water is tasteless and odourless. Hence, the TDS controller serves to balance the pH levels and make the water tasty and healthy to drink.

The mineraliser performs a similar function as the TDS controller. It supplements the mineral content lost during the RO purification. The mineraliser is a better option than the TDS controller, as it replenishes the specific minerals.

Comparison between different water purification systems

We have seen the different types of water purification systems in the above paragraphs. Each of these systems has its advantages and disadvantages. This comparison will highlight the difference between these systems and clear the concept.

RO vs UV vs UF

RO Water Purifier UV Water Purifier UF Water Purifier
Requires Electricity to operate Requires Electricity to operate No Electricity required
Kills and Removes all the Bacteria and Viruses from the Water. Kills all Bacteria and Viruses but their Dead Bodies remain in the Water. Kills and Removes all the Bacteria and Viruses from the Water.
Requires Electricity to Boost the Tap Water Pressure UV Water Purifiers can work with Normal Tap Water Pressure. UF Water Purifiers can work with Normal Tap Water Pressure.
Removes the Dissolved Salts Cannot remove Dissolved Salts Cannot remove Dissolved Salts
RO Purifiers has Prefiltration system to work with the Dirty Water. Water should be clear for UV to work. Works with Dirty Turbid Water.

Read: RO vs UV vs UF Water purifier

Frequently Asked Questions

1. Which water purifier brand offers the best after-sales services?

On this era of customer service, all water purifier brands offer good after-sales services.

However, it depends on various factors such as availability of service centres in your city, accessibility to spare parts, and so on. The best way to verify these factors is to do a local search on Google or go through Just Dial reviews.

Going through the official websites or e-commerce websites where customers post their reviews is also a good way of ascertaining the after-sales service facilities of water purifier brands.

2. What is the annual maintenance cost (AMC) for an RO water purifier?

Most of the top water purifier brands offer regular AMC services. The rates depend on various factors. Usually, it is in the range of around Rs 4,000 per annum. However, it is better to verify from the water purifier AMC provider.

This AMC includes the cost of replacement of the various filters like RO membrane, UV and UF filters, activated carbon filters, and sediment filters.

You have to replace these filters on an annual basis to extract optimum performance from your water purifier. Refer to the actual specifications

3. What are TDS Controllers / Modulators?

As the name suggests, TDS controllers control the proportion of TDS in the water coming out of the RO water purifier. Why do you need these controllers?

The RO purifiers reduce the hardness of input water by approximately 90%. Hence, if the TDS level of the water source is around 800, the TDS proportion of the output water will be in the range of 80.

This water with a low TDS level does not have good taste. Secondly, you need some minerals and salts in the water to enhance the taste. The TDS controllers work in the following manner.

The TDS controller divides the water that goes into the RO water system into two parts. One part goes through the RO membrane whereas the other part goes into the UV and UF filters.

The water that goes through the UV and UF filters do not undergo any change in the TDS levels. Therefore you get two different outputs. The final output is a mixture of both these waters. This is the job of the TDS modulator.

4. What is Mineralizer / Mineral guard

One must admit that the RO water purifier does a great job of purifying the water. But, it removes essential minerals along with the hazardous ones.

This leaves the output water with a bland taste that does not have much nutrient value. Therefore, you have water purifier brands including an extra stage of filtration that ensures the addition of essential minerals to the water.

This helps in maintaining the pH balance as well. Different brands have different names for these mineralizers. Aquaguard names it ‘Mineral Guard’.

5. How much water is wasted with RO water purifier?

The biggest drawback of RO water purifiers is that it wastes water a lot. For every litre of pure water it produces, the machines waste 2 litres of water.

The wastage of water depends on the quality of the input water. The higher the TDS of input water, the higher is the wastage

6. How do you use reject water?

The reject water contains 95 to 99% of impurities. Hence, this water is absolutely unfit for human consumption. However, there are other uses.

You can use this water for gardening, cleaning utensils, mopping floors, cleaning bathroom floors and toilets. However, one should note to wash the utensils with tap water to remove the salt deposits.

7. ABS Plastic or Stainless Steel tank – Which is better?

Storage tanks are essential ingredients in any water purifier. These storage tanks are anywhere in the capacity of 10 litres or more.

Hence, you need strong material to withstand the weight of the machine as well as the water. ABS (Acrylonitrile Butadiene Styrene) is a thermoplastic polymer capable of withstanding high-temperature fluctuations.

It is a recyclable material much unlike the thermoset plastics. They are non-toxic in nature. This makes this material perfect for manufacturing water storage tanks.

Steel is comparatively heavier to ABS plastic. Secondly, ABS plastic is non-toxic and more durable than steel. They can withstand a high-temperature range.

ABS plastic does not require as much maintenance as required by steel tanks. Hence, they are preferable to stainless steel tanks today.

8. Is it safe to buy water purifier online?

It depends on the customer and the website from where he chooses to purchase. Some people are more comfortable buying water purifiers after having a look at the features. Some people are comfortable buying online.

However, one should go for reputed brands from reliable websites like Amazon. You get good deals at these websites.

9. Can I buy a non-branded RO water purifier?

It is never advisable to buy a non-branded water purifier. Your health is always more important. Invest in a reputed brand because of the quality you get.

Non-branded water purifiers do not have TDS controllers or mineralizers. This affects the quality of the output. These locally made water purifiers might be inexpensive, but they are not worth investing. You will lose all the minerals in the water when you opt to buy the cheap ones.

Final Words

You have just gone through the Water purifier buying guide. This guide should help you make an easy decision about opting for the right water purifier for your home.

You can simply opt for an UV/UF water purifier if the TDS levels in your water source is below 500ppm. If the TDS levels are more than 500ppm, you have to install an RO water purifier.

Make sure that your RO water purifier comes with the combination of either TDS Controller or Mineralizer to retain the essential natural minerals.

Most of the RO water purifiers come with UV/UF Combination to ensure that the water is free from all the contaminants.

If you have any queries reading the selection of water purifiers, post them in the comments section below, and we will be glad to answer them.

793 thoughts on “9 Best Water Purifiers in India (2021) – Buyer’s Guide & Reviews!”

    • Delhi Jal Board mentioned that the TDS level of the water treated by its plants is around 400ppm. TDS in that range do not need RO water purification. If the TDS value is above 400ppm, you can install an RO water purifier.

      If you still have doubt about the TDS value in your water, you can measure it using a simple TDS meter that costs around RS 100 or 150. It will be available in medical stores or Amazon. For Water with TDS levels below 400ppm a UV + UF water purifier is the best option.

      Please mention the TDS value of your water source. You can also buy an RO water purifier that comes with a Mineralizer. These types of models do 100% RO water purification and add Minerals artificially at the end of the purification process. Let me know your choice, family size and budget so I can suggest a suitable model.

    • It depends on the TDS levels in the water source. If the TDS value is more than 500ppm, you have to install an RO water purifier. If the value is less than 500ppm, an UV UF water purifier is enough. You can test the TDS levels in your water source using a TDS meter. You can also install a 100% RO water purifier that comes with a Mineralizer. Such models add minerals at the end of purification process. For RO water purifiers, the maintenance cost will be around 4000 per year. The Maintenance will be less for UV UF models. Kent Maxx, AO Smith Z1 UV, Kent Ultra are some of the top UV UF models.

  1. My area municipal water TDS is 150 and ground water TDS is 350. We fill OH tank with Ground waterregularly sometimes with municipal water.
    1) Pl suggest me suitable Purifier.
    2) pl clarify the quality of water pump used in local brands machine and branded machine.
    3) Can I go for local brands with all specifications including Mineralizer
    4) Is Alkali filter useful
    Thank you

    • The TDS in both of your water sources is perfect. There is no need for RO water purifier or Mineralizer or any other extra features. Just install a simple UV UF water purifier to eliminate bacteria and suspended impurities. The Maintenance cost will also be low for UV water purifiers. You can buy an UV water purifier from reputed brand like Kent, Aquaguard, HUl or AO Smith. The Price is not much high for UV water purifiers.

  2. Mr.VS Chaitanya… Namaste.
    I have small business of ROs. I am going to make our own brand. The image mother and boy is good. Shall I use this on my ROs box. If so permit me.

    • Hi There, we have taken that image from HUL Pureit website. We are using un Creative Commons License not for commercial purpose, If you want to use on your RO box, you can get image from Pexels or Pixabay, they are many images that are free for commercial use.

  3. TDS value of water supply in our society is in the range of 200–225.

    I prefer to use UV and UF based water purifier, but product companies are not recommending for UV and UF purifiers as TDS value is more than 200. If we use the same then product company is not ready to provide the support warranty.

    Please suggest how to deal with this..

    Also, suggest the best make and model of UV and UF based water purifiers (under the counter models only).

    • TDS 340 is excellent. Just install an UV UF water purifier to remove bacteria and other contaminants. Kent Maxx, AO Smith UV are good models for you.

  4. Sir, Myself from Chennai. Our water has TDS 350, Hardness 164 ,Turbidity 3.
    1) What purifier to buy (RO or UV,UF only).
    2) Some makers have NF60. Can we go for this as TDS will be reduced by 50% only.
    3) Is Silver nano ionization better than UV in the water purifiers.
    Kindly advise

  5. I am from Kolkata. The TDS level of Govt. Housing Complex Ground water stored by pump is around 450 here.
    Which technology of water purifier should I consider to purchase?
    Please I do need your valuable suggestions in this regard.

  6. Hi,

    In my area TDS is below 300, water source is ground water which gets stored in the tank of the big housing society , also tank cleaning is not very regular.
    Could you please suggest me RO which is suitable for me. My preference s are steel tank, low water wastage, hot water. Please clarify.

    • TDS 300ppm is actually good. No need for an RO water purifier. An UV UF system can take care of all the bacteria and contaminants present in the water. Please have a look at the below model.

      A.O.Smith Z1 UV 10 Litre (Amazon Link – https://amzn.to/34m33v5)

  7. Hi, can you please suggest a water purifier that has a food-grade stainless steel UV chamber. I have heard most of the water purifiers come with aluminum UV chambers which are harmful in the long run. I have not found the material used for the UV chamber in any of the water purifier product descriptions.
    Thanks for sharing such an informative article.
    Hopefully, waiting for your more article in the future.

  8. First of all, you have explained water purifier in details. Thanks for such a nice post.

    I want to know two things.
    1st my water TDS is 89 and I do not want to go for any RO. Please suggest me water purifier that add mineral and remove impurities like UV and UF features.
    2nd can your help us to understand the Alkaline water concept. Is it good to have alkaline water intake regularly. Please do suggest good Alkaline water purifier also.


  9. Want to know about Alkaline water purifier. Which is one should buy RO or Alkaline. Please provide better option with Alkaline water purifier

  10. Sir, I am from Gunter, Andhra Pradesh. We are drinking tap water which is coming from terrace tank being filled up from muncipal water pipe line by pump, It’s tds may be around 400ml/l . To remove any bacteriand virous. , what type of water purifier is to be used.? Ro purifier or UV purifier or UF purifier or a purifier that consist of all these three . Please give necessary clarifiy. Thanking you, in anticipation.

    • RO water purifier with UV UF combination is required to remove excess TDS from the water. IF the TDS is above 400ppm, you have to install an RO water purifier otherwise UV UF water purifier is enough to remove the bacteria and other contaminants from the water.

  11. I am from HYDERABAD.
    Could you plzmlet me.know water purifier with hot water dispense and maintenance cost.
    My source of water is manjeera and TDS will be around 300ppm.

    Plz provide good water purifier with good customer service…..and also detailed filters with maintenance cost..

  12. I am from Hyderabad and bought the top of the line UV cum water purifier on 20th March and was promised that it will be installed the very next day. The idea behind it was we all in india were expecting the lock down and as I have a 85 year old fragile mother, I didnt want to buy water from outside vendors.
    Post the purchase, Shiva and Venkat would avoid my wife’s and my calls and we somehow got in touch with them and on their request we got a plumber who installed it online over video call with Venkat. It was not installed well and he promised that he will find a solution next day. He then disappeared again and when I escalated it to Ram Prasad, he put me on to another person Ravikant who again put me on to yet another person Ramakrishna. Ramakrishna mentioned that we “should not” drink the water till we check the TDS levels and that he will come the next day to check. Even this promise was broken and when i escalated this to Ram Prasad and REQESTED him to help us as WE WERE HAVING A MAJOR WATER he was most casual and disrespectful. I strongly do not recommend anyone to associate with such people who dont know the definition of “Customer Satisfaction”. I am scrapping the product and am telling all my friend’s and acquaintances about the experience. God save the company who has such people in the system.

  13. Hi.. My source of water is DJB, so TDS is not an issue but since we store water in overhead tanks, which are cleaned only once in a year, the organic impurities are a concern. Which RO should I go for.


  14. Hi Kitchen Arena team – I am confused with whether to go for a TDS controller or a Minaralizer based system.

    Can you please recommend a couple of options for both?

    • Hi Bipin, 2000 TDS is very high, You have to buy an RO water purifier.

      Please have a look at the below models

      Kent Grand 8 Litre Water Purifier with RO UV UF Technology (Amazon Link – https://amzn.to/3ayFRde)

      HUL Pureit Copper 8 Litre RO UV MF water purifier suitable for TDS upto 2000ppm (Amazon Link – https://amzn.to/2TvShgh)

      AO Smith Z9 Green RO (Amazon Link – https://amzn.to/2TKGFoe) 10 Litre RO SCMT model that can be used for water having TDS upto 2000ppm.

  15. I stay in Bangalore city (multiple dwelling unit society).The water is sourced from borewell, water tanker etc; TDS levels are nearly 450 (upon randomly checks) and i am looking for water filter which will guarantee best purification and 150 TDS levels (as per WHO recommendation). Presently i have Aquasure, which give 25 TDS post purification and i am looking for a filter which will give good water ( and not dead water), please advise.

  16. As per WHO recommended TDS level should be upto 150 post RO and all filtration process, which among all these filters guarantee 150 TDS ?

  17. Can you recommend us water purifier with technology ‘RO, UV/UF, MTDS ‘ don’t need to install, not needed tap connection, not need to mount on wall.

  18. Hi, I live in Delhi and use Borewell water with TDS 1200. We are a family of 4. Which branded ro is best and budget friendly.

  19. Between LG ww182ep(ro uv uf) and Aquaguard geneus plus(ro uv uf) which one will be better to buy ?Maintenance cost is also a factor (lesser is better). Thanks

    • Maintenance cost depends on your water quality. Purification wise, both the water purifiers you have mentioned are good and process is almost same. Please inquire about the service quality with local customer care and opt for the brand that provides good support.

  20. Hi I m living in an area where water TDS is around 1500 TDS. Which water purifier system should I go with? I am looking for something with low maintenance. Thanks

    • TDS 1500 is very high, you have to buy an RO UV water purifier that comes TDS Controller or Mineralizer. The Maintenance cost will be around Rs. 4000 per year for most of the RO water purifier. You can also opt for an AMC. Also, the filter life depends on the quality of the input water which in your case is bad. So, it is better to go with AMC. You can have a look at the below models

      Kent New Grand 8L RO (Amazon Link – https://amzn.to/2CtCvt1)

      Blue Star Majesto MA4BSAM02 8L RO UV (Amazon link – https://amzn.to/2K1CaSr)

      LG Puricare WW150NP RO UV (Amazon link – https://amzn.to/2NV4lni)

  21. TDS level of my home water is 600 and source is borewell water mixed with municipal water.
    Please let me know which technology purifier should be bought NF or RO?
    And please also suggest good brand for the recommended Technology.

  22. I have very clean bore water with TDS 507. I am using it directly for cooking. I want to pass it through RO and VF for drinking. Instead of using the overhead tank as source, which gets easily contaminated with dust. cobwebs and moss, I will use a separate 10 litre tank as source into which I will pump the bore water periodically. Can this tank be kept below the filter instead of above?

    • If the 10-litre water tank can provide enough pressure to pump the water into the water purifier, you can place it below the water purifier. As you will be using an RO water purifier with UV/UF combination, there is no need to install a sperate tank, you can just use the overhead tank as a Reverse Osmosis membrane is completely capable of removing all kinds of contaminants from the water.

    • Kent Grand star comes with RO UV UF purification process. Also, there is a TDS controller to retain the natural minerals in the water. The 9-litre storage tank comes with UV disinfection protection. Also, there is a digital display that allows you to monitor the status of the tank, filter life, and water quality.

      The purification process is the same as Kent grand plus but this model comes with a Digital display and the 9-litre storage tank that is suitable for large family also.

  23. Thanks for prompt reply
    If I do AMC for pureit will it not cover all expenses ?
    In TDS modulator of Kent a part of the water actually bypasses the RO membrane some potentially harmful dissolves salts may be left behind
    Whereas in Pureit all the water passes through the RO then fortified from mineral cartridge!!!!!
    Please opine

    • You can opt for AMC, it will cover all the expenses.

      Unless you are living in a very polluted area or near to a factory, there won’t be harmful TDS in the water. If you are not sure, you can go with Pureit Ultima or LG water purifiers that offers 100% RO purification.

  24. My water supply is bore well
    TDS around 700-900
    A bit confused what to choose TDS controller of Kent Grand plus or mineraliser of Pureit Ultima
    Kindly advise

  25. Hi
    Iam a resident of telangana, my water source is municipal water, tds around 250-280 which water purifier should i buy?
    How is 3m water purifier? MODEL- IAS140S,RO-R8 CW.
    Is UV/UF water purifier enough for me or should i go for a RO purifier?
    And what do suggest for whole house filtration systems??
    Kindly give your advice.

    • 3M whole house filtration system foes not require any electricity and removes impurities like dirt, mud and other suspended impurities that are larger than 5 microns.

      Normal UF water purifiers (UltraFiltration) comes with a pore size of 0.1 microns and are capable of removing bacterium and cysts from the water which is not possible with 3M filtration.

      The TDS levels in your water source are below 300ppm and good. So, there is no need to for a Reverse Osmosis water purifier. You can simply install a UV/UF water purifier like Kent Maxx, Havells UV Plus or Aquaguard superb UV Uf water purifier.

  26. Hi

    I am a resident of himachal pradesh, interested in buying a water purifier but getting confused after reading lots of articles on same.
    our water source is river water that comes from the glaciers. The TDS level is 24 mg/liter. For this i am sure i should not go with the RO system. But for UV UF please suggest me a good brand in terms of service and reliability. Havells UV plus or Kent Maxx? Or any other brand/model as per your experience?


    • The TDS levels in your water source are good and there is no need for an Reverse Osmosis water purifier. Both the models you have mentioned are the best selling UV UF water purifier models in India and the purification process is almost same. Contact customer service of both the brands and opt for the one that provides quick support at your place. Also, the AMC for UV UF models will be around 1500 per year and not much maintenance is required.

  27. Hi,
    Im living in chennai. I use borewater which is yellow water (high iron content).
    Currently I do two levels of Filteration:

    Level 1: Iron remover plant (MORF India). Output Water TDS – 912. AMC-Rs.3000/yr
    Level 2: Water Purifier (Aquaguard – RO Only). Output Water TDS – 115. AMC-Rs.4500/yr

    I Prefer to change Level 2 Water Purifier. Reason – Current Purifier is 12 years Old. But still runs good.

    Do I need RO UV UF OR just RO is enough?
    But certainly I would like to add minerals at the end of the cleaning proces.
    Kindly recommend a suitable water purifier for my case.
    Note: Still I would have Level 1 Plant.

    • Hi There, Some of the RO models come with UV/UF to ensure the water is 99% free from contaminants. Also, TDS Controllers are used to retaining the natural minerals in the water. In Some RO models, 100% water passes through the RO membrane and minerals were added at the end of the purification process. Such models were recommended if the water source is very bad. Otherwise, RO models with TDS COntrollers are also good. Have a look at the below models.

      LG Puricare WW150NP RO UV Water Purifier with Dual Protection Stainless Steel Tank (Amazon Link – https://amzn.to/2NnSZJQ)

      Eureka Forbes Aquasure from Aquaguard Delight RO UV MTDS (Amazon Link – https://amzn.to/33PV07p)

      Kent Grand with RO UV/UF TDS Controller (Amazon Link – https://amzn.to/2Zjj8f4)

      Eureka Forbes Aquaguard Enhance Ro Uv Uf Mtds Water Purifier (Amazon Link – https://amzn.to/31Yj8mx)

      Please read this post to know the difference between TDS Controller and Mineral booster (https://www.kitchenarena.in/tds-controller-vs-mineralizer/)

    • What is the level of the TDS in your water source? If it is more than 2000ppm, domestic water purifiers are of no use.

      Anything less than 2000ppm, you can use an RO water purifier. To remove iron impurities from the water, you definitely need to install an RO water purifier. Reverse Osmosis is capable of removing Salts and Hard metals from the water.

      To find the TDS levels in the water, you can use a TDS meter or you can take the water sample to the nearest lab.

      Also, most of the Reverse Osmosis water purifier comes with UV/UF combination to ensure the water is 100% free from contaminants.

      Some of the RO models come with TDS Controllers and some models have Mineralizer.

      In your case, it is better to opt for a 100% RO water purifier with Mineralizer where 100% water flows through the Reverse Osmosis chamber.

      RO models with TDS Controllers allow some water directly into UV/UF chambers.

      As your water has a high concentration of Iron, it is better to go with 100% RO models. There are many such models available from top brands.

  28. I want to buy water purifier but i little bit confused which one i should go. There are some technology like RO, UV, UF. Please suggest me which one is best.

    • What are the TDS levels in your water? What is your water supply source? If you get water from borewell or multiple sources, you can install an RO water purifier. Most of the ro water purifiers come with the combination of uv/uf for providing additional safety.

    • That model comes with a TDS Controller to retain the natural minerals. Both methods are good. Normally RO is enough to remove all the contaminants from the water. UV/UF are used for extra safety. Livpure Glo lite comes with RO UF combination. If Livpure provides good service at your place, you can go with that model.

    • Performance and purification wise, there is no difference. But, the Kent Grand Star comes with a -built UV disinfection in the storage tank so you can store the water for a long time in the 9-litre storage tank. Also, there is a Digital display which allows you to monitor the status of the tank, filter life and water quality.

      But, the output water quality for both the water purifiers is same.

  29. Hi,
    Please suggest the best water purifier for me,

    We are getting water from multiple sources sometime municipal, tank and borewell and TDS like 200-250, 400-500 and 800-900 respectively.

    I am confused between two technologies one use by Kent (RO VU UF TDS) and other use by aquaguard (RO UV MTDS) with mineral guard and active cooper etc.

    I have short listed few model, Kent Grand * , Kent Grand Plus, Kent Prime, Aquaguard Reviva Nxt( RO UV MTDS) andDr. Aquaguard Magna Nxt HD(RO UV MTDS).

    At present, I am using Aquagaud RO Reviva from last 12 years.


  30. Which do purifier wastes the least water? People say it’s Kent supreme but generally the reviews are not good for Kent supreme.

  31. Hi .. very useful blog. I live in Bangalore, where we get multiple source water (mixed). I am not convinced with Kent or other major brands who advertise much but service delivery is poor.

    What is your opinion about BRITA water purifiers? They are slightly expensive, and are not into major advertising yet, but their product specs look impressive – RO UF UV filtration, Alkatron technology to infuse lost minerals, stainless steel storage container, good service promise (call back in 1 hour, issue resolution in 1 day) etc. Also in their AMC they promise even the RO filter replacement.

    Any thoughts would be welcome.


    • The Purification process is almost same in Brita or any other major RO water purifier brand. These water purifier brands use different | Attractive technology names for the simple purification process. At the end of the day, RO purification process is all the same. Some brand use TDS Controllers and some use Mineralizers for retaining the natural minerals that are lost during the RO purification process.



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