TDS is a common terminology in use whenever you discuss water purification.

What exactly is TDS?  Let us look at this concept in brief.

Water is the Best Health Drink in the world that contains no fat, no calories, and no cholesterol. There are a lot of hazardous contaminants found in the drinking water that includes toxic elements, pesticides, radiological hazards and other pollutants.

Health Authorities often check the following to make sure that the water is safe.

  • PH
  • Presence of Dissolved Oxygen
  • Color
  • Hardness
  • Presence of the Bacterial Growth, Algae, algae
  • Total Dissolved Solids (TDS)

Total Dissolved Solids

A water molecule in its purest form contains 2 atoms of Hydrogen and 1 atom of Oxygen.

But, the water available from natural sources like rivers, lakes, and groundwater does not conform to this molecular formula.

This is because water contains a lot of organic and inorganic salts dissolved in it.

This water contains calcium, magnesium, sodium, potassium, sulfates, carbonates, nitrates, and fluorides among many other salts.

This seems to be a very long list, but the positive aspect is that you need a majority of these salts for your overall growth.

You need a certain proportion of these solids in your drinking water.

However, water can contain other contaminants such as heavy metals like arsenic, lead, and even mercury. These chemicals are dangerous and require elimination.

TDS up to a certain level is acceptable for human consumption.

It is only when the TDS proportion exceeds 500 (500 ppm) does it become hazardous. You would require the use of water purifiers to eliminate the excess TDS.

The Hardness of the Drinking water is created by naturally occurring substances like calcium (Ca) and magnesium (Mg).

Total Dissolved Solids (TDS) are the total amount of the mobile charged ions in a given volume of water which include minerals, salts, cations, anions, and metals.

TDS = The Total number of cations and anions in the water.

Rain Water is the Purest form of water, and the TDS of rainwater is few tens of mg/L.

TDS is represented in units of mg per unit volume of the water ( mg/l ) that is also referred to as parts per million ( ppm ).

The Dissolved salts come from both natural and inorganic sources. The Organic sources of the dissolved salts include leaves, plankton, trash from industries, pesticides, fertilizers and more.

Water will also pick up metals like lead and copper when it travels through the pipelines.

The Dissolved salts also come from the artificial sources such as rocks, atmospheric gasses, nitrogen iron, and minerals also.

Over time,  Water purifiers will lose the capability of removing the Dissolved salts from water.

You should observe the Quality of the membrane in your water filter and should replace it when required.

Please note that the presence of the Dissolved salts in water will affect the taste.

According to World Health Organization, TDS level less than 300 mg/litre is considered as excellent, between 300 and 600 mg/liter is good, 600-900 is fair, 900 -- 1200 is poor and TDS level more than 1200 mg/liter is unacceptable.

In India, If the TDS level is above 500mg/liter, the water is considered as disagreeable. But, due to the lack of water resources, people are drinking water that has greater TDS Levels.

TDS in Indian Water

According to the BIS Standards, the maximum desirable TDS is 300 mg/l and maximum permissible is 600 mg/l.

WHO states that the water containing TDS concentrations below 1000 mg/litre are acceptable for the consumers. Lesser the TDS, Better the Water

How to Reduce the TDS in Water?

There are a lot of RO water purifiers available online that can reduce or remove the Dissolved salts in the water.

The most widely used Water Purifications Systems are Carbon filtration, Reverse Osmosis, Distillation, and Deionization.

In Carbon filtration, the Charcol consumes many toxic compounds when the water is passed through the activated charcoal.

Reverse Osmosis

Reverse Osmosis is one of the most commonly used filtration systems that removes all the dissolved contaminants in the water. The Only problem with RO is, It needs a lot of water.

The RO process splits the water into two parts and drives the dissolved salts out from the part into other.

As I mentioned above, Reverse osmosis requires a lot of water, and the wastage is also high.

If you input 3 Litres of Water into the RO Process, you will get one litre of Clean water and 2 liters of Dirty water.

So, when you are planning to buy a Ro Water Filter, Make sure you collect the dirty water and use it for cleaning the house. Don’t waste the Reject Water of Reverse Osmosis purification system.

The Cost of the RO Water Purifiers ranges from ₹8,000 to ₹15,000.

Read: Pros and Cons of UV Water Purifier

Please note that the Normal Ro Water Purifiers might not perform Good when the TDS level of the water is in thousands.



Distillation involves boiling the water and produce the water vapor that rises to a cooler surface and condensed back to liquid. Distillation is one of the oldest forms of water purification which is still used to convert the sea water to drinking water.


In this process, the Dissolved salts in the water are removed through the ion exchange. By Controlling the electric charge of the ions in the water, the Deionization removes the TDS from the water.

Add comment

E-mail is already registered on the site. Please use the Login form or enter another.

You entered an incorrect username or password

Sorry that something went wrong, repeat again!


by Newest
by Newest by Oldest

Accurate drinking water TDS how much required

Kitchenarena Team

Around 300ppm is very good


TDS level is our drinking water is around 100 ppm but the taste is very salty. Please suggest which water purifier we should opt for.

Kitchenarena Team

The TDS readings might be wrong. Normally, if the water is salty, the tds levels will on the higher side. You can opt for a 100% RO water purifier that comes with a Mineralizer.

Mahadev Kulkarni

Our water TDS level is 15 after RO filtered, is it good for health? How to increase TDS level by adding some consumeble food products (like salt, sugar etc). Or Is it good to idea to mix little amount of input (hard) water whose TDS is 765 or RO discharged water (which goes in waste usually during filtering process) whose TDS is 165, in order to increase TDS level of filtered drinking water..? Is there any harm in consuming such mixed water ? Please suggest.


add mineral cartage at last stage to improve taste and mineral which makes water healthy for body.


My Municipal Tap water sourced from deep borewell by Municipality provides 320 TDS water. Which purifier should I user. I was using Gravity based Pureit Advanced but from last 1-2 months I am seeing green algae depositing in lower filtered water container and also some white limestone type material floating at surface of purified water. My Germikit indicator is still OK and not Red. I am confused.


use water filter without ro membrane as tds is in acceptable range no need to use ro membrane but you need to use spoon filter ,carbon filter to remove other impurities in water.


In my RO water purifier TDs is 200 it is good or bad.

Kitchenarena Team

TDS is very considered good.


Keep between 80-150 @dr.saurabh

Harpreet Singh

Hi Sir,

I need your urgent help. Since 27 years we are drinking tab water and no issues. But recently dust particles coming through tab. So we thought of installing RO.

TDS checked by eureka Forbes guy is 238.

Then when I visited the shop come to know that there are many kinds of water purifier like only purifier /RO/UV.

Then shopkeeper suggested me Alkaline. Which reduce TDS to 30 and then mineral cartridge will add mineral.

Tell me this adding mineral later is not harmful? Which purifier you will suggest.

Kitchenarena Team

No need to buy an RO water purifier as the TDS levels in your water are good. Just buy a water purifier with UV + UF combination like Kent Maxx. If you are not sure about the TDS or the water is kind of salty, then you can buy an RO water purifier.


TDS is 29. Harmful????


borewell water TDS is 210-250 in my area, should I go for RO or UV+UF will be good option?


Tds 79 is good. If your machine has RO+UV facility, then you are advised to increase tds up to 100, which will be excellent, will provide tasty and adequate mineral containing water. Technician can adjust for 100 tds in RO+UV machine.


Hi, I just got my home RO system serviced and got 48 tds readings. Is it okay to drink and cook food or I have to get tds increased ?

Sunil Kumar Singh

It should be within 150-300.

William 9211972972

You require a reverse osmosis plant for that and according to the quantity of pure water needed starting from 25000 to 3,4,5,10 lakhs etc




My bore water is 2800tds. Suggest me a good water purifier method.

Siddappa Khandolkar

Hi I’m using Aquaguard enhance water purifier and the normal TDS value is 330PPM after using filter the TDS value is 30PPM.
Do I need increase the TDS value in filter please let me know?


sure. you have to make it for 70 to 80. it is a healthy one.


Hi , we use borewell water, which has tds value of 180 ppm , we use livpure pep pro + + RO which current tds value is 79 ppm but am very confused with the technician from livpure as they say the ideal drinking water is below 40 ppm . You mentioned here the ideal water should be between 100 to 300 ppm . First of all do we need RO system as our borewell water showing 180 ppm and why the technician guys say below 40 ppm.

William 9211972972

Actually it’s right that we should drink the water with tds value between 200-300 which contains he adequate minerals and calcium which our body needs still we are adapted to the water taste which have tds below or equal to 50-70 which our r. O. Plus u. V. Give us that’s why these days people complain about the bones problem and the calcium is provided in form of medicine by doctors, but the natural way to obtain these things is best through water…. Like the water from Himalayan springs is best to drink which is available in market at about 100-250 rupees per litre (branded)


Tds level of 47 is good or bad..


Hi the water we use is from multiple sources (bore/ tankers) and TDS varies between 500 and 1500 depending on season. Which purifiers are good for TDS ranging from 500 to 2000 TDS?

Jagdamba water purifire

yes it should be betwen 80 to 100


My ro +uv water purifier gives water of 35 TDS. Is it ok?


55 tds is good or bad for health please giude me?


tds level 400-500 which purifier needed?


R. O. Plus u. V. Is best for you with tds adjuster

Kitchenarena Team

If the TDS levels are above 300ppm, you have to opt for an RO water purifier that comes with a TDS Controller. Some of the top-selling RO water purifier models are Kent Grand Plus, Kent ACE Mineral, Livpure Glo. You can have a look at the full list here:

Kuldeep Singh Negi

Hi Sir

I am using MCD Water and having TDS Laval 145 , we are using low TDS membrane and getting output TDS 29. Is this ok for Drinking or not please suggest.

chittaranjan Muduli

My water is very odd smell/odd teast and after purification it became shawer and tea or food became odd teast, what is reason

Kitchenarena Team

No need reduce the TDS levels in your water. 145 TDS is good. Just use UV/UF Purifier to remove bacterium and other suspended impurities.

Suraj Rajegave

Tds Level below 25 good or bad

Kitchenarena Team

The water having TDS levels below 25 might be deprived of some natural minerals. You can consume such low TDS water (Water purified via RO) when you are residing near to a chemical factory or the surroundings water is very polluted. Otherwise, there is no need to decrease the TDS levels of the water to such low ppm.