How to choose a Water Purifier (2021)- Tips and Beginners’s guide


This is the ultimate guide to How to choose a Water Purifier in 2021.

Table Of Contents

How to choose a Water Purifier for home

TDS of drinking water 

Before you choose a water purifier for home, knowing the Total Dissolved Solids (TDS) of drinking water marks the first step. This is the most important step in determining how to choose a water purifier! You can calculate the TDS of drinking water with a TDS meter, which is present with any water purifier technician. It is also available online for around Rs. 200. It is worthier to purchase one, as it is useful in the long run.

Type of Water Purifier for home

After you calculate the TDS of drinking water, choose a water purifier for home that will accommodate your necessities. Do not fall into advertisement traps, buy it considering the TDS of drinking water and the type of water supply (i.e. Tap water or groundwater).  

Online options

It has been observed that stores do not provide many options when it comes to water purifier. They routinely include the most established brands. Remember, the internet is amazingly powerful. As it is serving you on How to choose a water purifier, it will surely equip you with many more convenient options. In any event, the fitting and maintenance are done by brands and not the sellers. In combination you may also look for other kitchen appliances like a Induction cooktop, Electric kettle, Thermos bottle which may further increase the discount price of your water purifier.

Water wastage

For purifying 1 liter of water, most RO water purifiers for home requires 4 litres of water on average, i.e. nearly 75% of water wastage! You can collect this wastewater and use for other household chores. But, if you are living in an area where you do not enjoy surplus amount of water supply, having a RO water purifier for home is not a clever idea.

Local brands

You may even consider a local brand of water purifier for home, but make sure they have a good filter life. Most of the times the local brand are way cheaper but the maintenance cost is excessively high. There is a chance that your filter change alarm will beep often!

Annual Maintenance Contract (AMC) 

Depending on the TDS of drinking water, you may need to maintain your water purifiers frequently. Check out for the AMC of various water purifiers for home that you have shortlisted. This is a valuable tip on How to choose a water Purifier for home. AMC can be a deal maker or a deal breaker.


Choose a water purifier for home according to your family size. A water purifier with a capacity of 5 liters won’t suffice a family of six members. Moreover, equip yourself with information about the quantity of water it purifies within an hour.


Once you have shortlisted the water purifiers for home, call at their toll-free numbers. Check out for installation charges, standard warranty, specific type of mounting (i.e. either wall mounting or corner, table mountain), water level indicator and filter change alarm.

Free Demonstration

In these times, most of the water purifier brands provide a free demonstration at your home. I would suggest you to get a free demonstration before you choose a water purifier for home.

Inlet Water tank 

Make sure your inlet water tank is at a minimum of 15 feet higher than the place where you are planning to install your water purifier. Alternatively, you may have to buy a booster pump to provide sufficient water pressure needed for some water purifiers.


Look out for the place where you have to install your water purifier as it should neither be too high from your head level and is easily reachable. You should have enough space for the water purifier and Pre Filter to be installed.

Pre Filter 

It is wise to opt for Pre Filter as it will surely increase the life of the Water purifier.


Buying a water purifier cover will radically reduce your extensive work of cleaning it every weekend.

Quality of Service

Please acquire a general idea about the quality of service that is provided in your area by the brands that you have shortlisted. As there are many instances where in a particular area, a good brand is unable to provide good service.Hitherto, you have known about How to choose a water purifier. Wait, your job is still incomplete, arm yourself with knowledge of Water Purifier maintenance.

After you chose a Water Purifier 


Be present during installation 

Make sure you are personally present during the installation of your new water purifier. Request the technician to explain the features and provide a working demonstration to you. Check out the TDS of drinking water again and make sure it is under control. Leakages 

Check out for leakages

It is typically experienced that the local technician is in a hurry and desperately wants to leave at the earliest. Ensure that he does his job perfectly by taking all the time he needs. If he is not cooperative escalate the unfortunate situation at their toll-free number.

Save water and electricity 

If you genuinely want to conserve some water and electricity please switch off the purifier once it is completely filled with purified water. Some purifiers purify the filtered water again if not utilized within a few hours.

Utilizing Wastewater 

Make full use of the wastewater. You can employ it for washing utensils, clothes and vehicles. It can be utilized for mopping floors and gardening. You can additionally utilize it in water coolers and flush tanks.

Clean the nozzle 

Keep cleaning the nozzle of your tap. Most of the times people experience flies sitting at the nozzle of the tap which makes the drinking water unhealthy.

Changing candles of Pre Filter 

Keep changing the candles in your Pre Filter as soon as they are filthy. A better Pre Filter undoubtedly aids you to have a better water purifier. It makes certain that your filter change alarm is not beeping any time soon!

Rechecking the TDS of drinking water 

Wisely keep measuring the TDS of drinking water in every 3 months to recognize the performance of the water purifier in your home. If the TDS of drinking water has increased enormously, possible chances are the filters in your water purifiers are not working as they should be.

Cleaning filters regularly 

Contact a qualified technician in every 3 months to clean the filters. This is the most critical part to have a better water purifier life, which is ignored by most of the people.

Maintenance cost 

Maintain a note of the maintenance cost in the first year, as it will be helpful for you to decide to go for AMC or not. All of this again depends on the quality of water in your home.

In case of a part replacement, check for online prices

If your filter change alarm started beeping there is a chance that one or more filter of the water purifier has to be changed. Check for online prices as it is seen that the parts are cheaper at online markets. 

Writing feedback may undoubtedly support you 

Do write genuine feedback from the site that you have purchased your water purifier. The brands keep a close eye on the reviews. They make certain that if a loyal customer is encountering any problem, it is resolved efficiently.

What is RO, UV, UF & TDS?

Many times you might have come across filter technology jargons like RO, UV, UF, etc. Here, I will explain to you the meaning these frequently used terms. This article will also be informative if you are in a dilemma over “how to choose the best water purifier.”


TDS stands for Total Dissolved Solids which is calculated in ppm (parts per million). The organic and inorganic substances like minerals, salts and heavy metals dissolved in water account for the TDS in water. You can calculate the TDS in water with the help of a TDS meter. Based on the TDS in water and the source of water supply, you can choose the best water purifier suitable for you as shown in the table below. Click on the type of water purifier to know better about it.

 Type TDS Source Nature Water wastage Requires electricity
 Gravity <300 Municipal water Muddy No No
 UV >300 Municipal water Clean No Yes
 RO >300 Ground-water Clean/ Muddy Yes Yes
 RO+UV >300 Multiple Clean/ Muddy Yes Yes

TDS controller 

If the TDS in water is anywhere from 50 ppm to 150 ppm it is considered as best for drinking. The TDS of your drinkable water should not be less than 50 ppm. It should contain essential minerals like calcium and magnesium in small quantities for our superior health. With the help of a TDS controller, you can set the TDS of your purified water within safe limits.

Pre Filter

A prefilter is typically installed outside the water purifier. This is an optional step in the purification of water, but it is effective to maintain it as it increases the life of your water purifier. Water is passed through a Prefilter which has a micro spun of pore size 5 microns. This removes all the dust particles and sediments that are dissolved in the water. This is the key reason that whenever you change the spun after 3 to 4 months it has changed it color from white to brown.

UV filtration

UV stands for UltraViolet rays. The bacteria present in the water may cause water borne diseases like typhoid fever and cholera. During this filtration process is through the which deactivate these bacteria. Although these bacteria are inactivated by killing their DNA their bodies continue to be in water, This is further purified through a semipermeable membrane. This Filtration step needs electricity to work and is workable only if the water is not muddy.

Activated Carbon Filter 

Activated Carbon filter removes chlorine, pesticides and other chemicals present in water. It is the Activated Carbon filter which changes the taste and odour of water. These days activated carbon filter is present in most of the electric as well as non-electric water purifiers.


RO stands for Reverse Osmosis. During Reverse Osmosis the water is directed through a semipermeable membrane having a pore size of 0.0001 micron to remove the salts of calcium, magnesium and other heavy metals. As the pore size is extremely small, the water should be pushed through this filter with a strong force. This force can be naturally generated with the help of gravity, if your water storage tank is at least 20 feet above the water purifier. As an alternative, this force can be mechanically generated with the help of a booster pump.


UF stands for Ultrafiltration. This has another semipermeable membrane which removes bacteria, viruses and protozoa. Ultrafiltration (UF) is different from Ultraviolet (UV) Filtration. Ultrafiltration does not deactivate the microorganisms present in the water rather it purifies them out.


MF stands for Microfiltration which is able to purify simply the bacteria present in the water.


NF stands for Nanofiltration. It purifies Divalent ions which cause hard water to be formed.

Semipermeable Membrane  Size Bacteria  Purification Viruses Purification Multivalent ions Purification Monovalent ions Purification
 Microfiltration  0.1
 Ultrafiltration  0.01
 Nanofiltration  0.001
 Reverse Osmosis  0.0001

We hope this article has assisted you on How to choose a Water Purifier for home in 2021 and Water Purifier maintenance. We wish you end up buying the best suitable water purifier for home and make the most of it!

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