With increasing population and industrialisation, one finds deterioration in the quality of water supplied through municipal taps.
Human and industrial waste has contaminated river water sources.
The groundwater quality is also not of the highest standards, as they come contaminated with high levels of TDS.
Using water purifier is a a viable solution. Different types of water purifiers are available such as,
UV water purifier is recommended when the TDS levels in your water source is below 500ppm only.
In General Contest, If you get municipality water which is not salty in nature and you want to remove bacteria and germs from the water, UV purification is the right choice.
We shall look at the best UV water purifiers in this section before discussing the points to consider before purchasing a UV water purifier.
Best UV Water Purifiers in India
1. AO Smith Z1 – UV 10L Wall Mountable
AO Smith is a top international brand of water purifier producing some of the best UV water purifiers in India. It has a sleek appearance and boasts of a reliable performance because of its excellent features.
Appearance-wise, the AO Smith Z1 is ideal for enhancing the kitchen environment. It works on UV technology and performs the best when purifying water with TDS levels less than 200 ppm.
The UV Life Alert feature indicates when it is time for replacing the lamp.
2. Kent Maxx 7L Wall mountable cum tabletop UV + UF Water purifier
Kent is one of the best-selling Indian brands when it comes to kitchen appliances like water purifiers. These water purifiers are the most reliable because of their incredible features.
Kent water purifiers are versatile because they come with different installing options. This water purifier can be mounted on the wall and placed on the kitchen top, as well.
It works on UV + UF technology to provide safe and hygienic water 24×7.
Kent offers pan-India service, as it has more than 1500 service centres spread all over the country.
3. Eureka Forbes Aquasure from Aquaguard Aquaflo DX Wall Mountable UV water purifier
Eureka Forbes is one of the oldest companies manufacturing water purifiers in India. They offer a range of appliances, of which this UV water purifier stands out for its popularity.
This Eureka Forbes UV water purifier is the ideal appliance when you wish to have instant pure water. As it does not feature any storage tank, there is no question of recontamination of water during storage.
The excellent flow rate of two litres per minute ensures you get instant pure water whenever you need it.
This UV water purifier can handle source water with TDS levels less than 300 ppm.
4. AO Smith X2 5L UV + UF Water Purifier
Here is another AO Smith model that can deliver pure water at the touch of a button. UV + UF technology ensures double protection.
This AO Smith UV + UF water purifier is the ideal one for use in cities where you get RO-treated municipal water in your kitchen taps.
This wall-mountable device comes in attractive dual colour design. It is one of the most attractive appliances to adorn your kitchen, as it blends beautifully with the other appliances.
5. Eureka Forbes Aquasure from Aquaguard Smart 20W UV water purifier
The advantage of using this UV water purifier is that it does not use any chemicals for purification. This water purifier offers superior UV protection because of its excellent features.
The UV rays deactivate the disease-causing bacteria and other microorganisms to protect the entire family.
The high-grade Quartz glass sleeve protects the UV lamp and does not allow it to touch the water. The advanced UV lamp sensing mechanism is a welcome addition as it stops dispensing water during malfunctioning of the appliance.
The provision of a glass holding tray makes it convenient to fill bottles for storage.
6. Kent Ultra Storage 7L UV + UF Water purifier
Kent water purifiers generally come with adequate storage capacity to ensure that you get pure water even during power cuts. This UV + UF water purifier works best when you use it to purify pre-treated RO water supplied through municipal taps.
This Kent water purifier uses a double filtration method to purify water. The UF membrane takes care of the minute contaminants, whereas the UV lamp eliminates bacteria, viruses, and other harmful microorganisms.
Thus, you have pure and hygienic water to drink every time.
This water purifier features an inbuilt SMPS instead of a standard adapter. Thus, it can withstand massive voltage fluctuations in the range of 100V to 300V. The 1L/min water flow speed is a good one for domestic use.
7. Havells UV Plus 8L UV UF Water Purifier
Water purifiers, generally, occupy space in the kitchen. Havells makes beautiful use of space by introducing a water purifier that can be placed at the corners.
Havells water purifiers come with a futuristic design that enables you to mount it in a corner. This water purifier is available in an excellent combination of blue and white colours with a transparent water tank.
The smart alerts prove useful to inform the user about the time to replace the UV lamp. The Ingress Protection tank cover stops the external invasion of insects and dust particles. The removable tank allows you to clean it periodically.
UV Water Purifier – Buying Guide
Before we proceed with the things to consider while purchasing a UV water purifier, one should understand the difference between UV and RO water purification.
UV Water Purification
UV or Ultraviolet water purification is one of the safest methods of water purification. The process ensures elimination of 99.99% harmful bacteria, viruses, and other contaminants, thereby making the water pure to drink.
The water passes through a tank equipped with a UV lamp to kill the bacteria and other microorganisms.
The most significant highlighting feature is that there is no addition of any chemicals to improve the taste of water.
RO Water Purification
RO or Reverse Osmosis water purification is a comprehensive purification process for removing TDS from source water.
This process involves the water to pass through a reverse osmosis membrane to remove TDS. The resultant water is pure and free of TDS.
However, the process of RO purification removes essential chemicals like magnesium, calcium, and others.
Therefore, RO water purifiers come with TDS control mechanisms or mineralisers to add these minerals after the purification process to improve the water taste.
Working of UV Water Purifier
Working of RO Water Purifier
RO water purifier works on a multi-stage purification process. It begins with the sediment filter to take care of visible, insoluble contaminants.
The activated carbon filters remove organic impurities. The Reverse Osmosis membrane then takes over the job of eliminating TDS.
The water then passes through another layer of an activated carbon filter to remove any traces of bad odour.
If necessary, the RO-purified water is passed through a UF membrane and UV chamber to ensure the elimination of microorganisms.
Finally, these purifiers have a TDS controller or mineraliser to replenish the essential minerals lost during the RO purification process.
RO vs UV Water purifier
Compared to the RO process, the UV chamber purification is a straightforward method.
However, one should ensure that the TDS levels in water should not be more than 500 ppm. If TDS is more than 500 ppm, one should invest in a RO water purifier.
Components inside a UV water purifier
There are four primary components in a UV water purifier.
The Reactor Chamber
Generally built using stainless steel, the reactor chamber houses the UV lamp and the Quartz sleeve. The primary function of this chamber is to control the quantity of water flowing through the system.
The UV Lamp
The UV lamp is a critical component that is responsible for purifying the water. It generates UV-C radiation, also known as germicidal.
These UV lamps contain filaments to generate electric current and heat the mercury for producing UV-C light rays. This heat evaporates the air inside the lamp to create electric arcs that produce UV-C radiations with varying intensity levels.
The Quartz Sleeve
The Quartz Sleeve comprises a long, cylindrical tube made of quartz glass. It protects the UV lamp from coming into contact with the water directly.
The UV lights pass through the glass walls and eliminate the microorganisms. These contaminants often settle down on the outer surface of the Quartz Sleeve.
Therefore, one should clean the sleeve when replacing the UV lamp. It enhances the purification process.
The controller unit performs several critical functions like controlling the UV lamp output to generate UV-C radiation necessary for eliminating the bacteria and other microorganisms.
The controller unit varies, depending on the complexity of the system or usage.
Some of the optional attachments include low UV alarms, lamp-changing timers, and indicators to alert users of any system failure.
Advantages of UV Water Purification
Here are the advantages of UV water purification.
- UV purification can destroy up to 99.99% of bacteria, viruses, and harmful microorganisms to make the water pure to drink.
- UV purification is an eco-friendly process, as it does not involve the use of chlorine and other harmful chemicals.
- The water does not undergo any variation in the taste when using UV purification.
- UV water purifiers are easy to maintain. One needs to clean the purifier regularly and replace the UV lamp annually.
- The UV process can kill pathogens like Cryptosporidium and Giardia that are resistant to chlorination.
- UV filters consume less power when compared to RO water purifiers. They are economical, as well.
- The UV purification process can work in combination with other purification methods like RO and UF.
- UV water purification does not waste water like the RO water purification process.
- The water does not come in contact with the bulb. It is only exposed to UV radiation.
Disadvantages of UV Water Purification
One should also know the disadvantages of UV water purification before purchasing UV water purifiers.
- UV purification can eliminate microorganisms alone. It does not remove visible impurities like mud. It also does not remove TDS from water and chemicals like arsenic and chlorine.
- The UV water purification is effective only when there are no visible impurities. It is suitable for water having TDS levels up to 500 ppm without any turbidity.
- If the source water is turbid, you should use a UV-cum-UF water purifier. If TDS levels are more than 500 ppm, one should go for a combination with RO.
Things to consider when purchasing UV water purifiers
The choice of the ideal water purifier for the home depends on various factors. One should look into them carefully before selecting the best UV water purifier.
Contaminants present in water can scatter or absorb UV light, thereby affecting the water purification process.
These contaminants include iron, manganese, and others. Water that is free from such contaminants is the best for UV treatment.
Similarly, suspended particles in water also need elimination. Therefore one should ensure that the source water satisfies these parameters. Otherwise, you might need an additional filtration method like a pre-filter, UV filter, or even RO filtration.
Water Flow Rate
The water flow rate depends on the number of people in the household because the water consumption of four people is more than that of two persons.
One should check out the water flow rate and invest in a UV water purifier that has a better flow rate than what you have calculated.
Generally, UV lamps last for a minimum of one year. Therefore, one should figure out the replacement cost of the UV bulb before investing in a UV water purifier. Purchasing a water filter featuring a UV bulb with an extended lifespan is advisable.
Generally, UV water filters do not come with high storage capacity. Your home should have a continuous water supply. If you do not have any such facility, it is better to opt for a non-electric water purifier.
Mode of Operation
The automatic mode of operation is the ideal one. The UV bulb switches off when the purifier is not in use. As the UV bulbs come with a limited lifespan, the automatic mode of operation enhances the overall life of the UV water purifier.
Ease of use is critical for any home appliance. UV water purifiers that enable you to get pure water at the touch of a button are ideal.
UV Fail Alarm
The UV lighting is invisible to the naked eye. Therefore, you will never know whether the lamp is functioning or not.
A UV Fail Alarm should be an integral component of the water purifier, as it alerts you when the lamp is not functioning. You can get the lamp replaced accordingly.
Adequate wattage is necessary for getting accurate UV-C and SW radiation. A 55W, 120V UV water purifier should be ideal for an Indian home.
Ease of Installation
You have wall-mounted and tabletop UV water purifiers. Select the one according to your convenience. It is better if you have professionals install the water purifier for you. Almost all manufacturers undertake the installation job, as well.
The modern-day UV water purifiers come with additional features like LED indicators, touchscreen display, shut-off valve, and flow meter. These are useful features that add to the convenience factor.
Some of the other aspects to look out for are the certifications, customer support, warranty, and pricing.
Who should purchase a UV water purifier?
Better to go for RO + UV purification
Frequently Asked Questions about UV water purifiers.
UV water purifiers generally eliminate all kinds of bacteria, viruses, and microorganisms that cause water-borne diseases. The best aspect of UV water purification is that it does not change the odour or taste of the purified water during the purification process.
Yes, Different types of microorganisms require a specific minimum dosage of UV energy for their elimination. Bacteria like E.coli, Giardia, and Cryptosporidium need a minimum dosage of 10 mj/cm2 (millijoules per centimetre square).
The (National Sanitation Foundation) NSF-rated UV water purifiers can provide dosage up to 40 mj/cm2. The standard certification is 30 mj/cm2.
Yes, UV water can eliminate up to 99.99% of bacteria and harmful microorganisms. The modern-day RO water purifiers also come with a UV purification attachment. Hence, UV purified water is pure and safe for drinking.
No, UV purification does not get rid of TDS. It can only eliminate microorganisms. Therefore, one should opt for a RO and UV combination to get rid of TDS and bacteria.
It depends on the quality of source water in your locality. Each of these processes is good in its way. If the water has microbiological contaminants, the UV water purifier is the ideal one to have.
If the source water is turbid and without microbial contamination, the UF purification should be fine. If the TDS levels exceed 500 ppm, one should necessarily go for RO water purification.
UV lamps can last for a minimum of a year of continuous usage. One should invest in UV water purifiers that come with filter alarms. It indicates when to replace the UV lamp.
Some of the best UV water purifiers available today are AO Smith, Eureka Forbes, Kent, and Havells, to name a few. We have discussed seven of these water purifiers in this article.