How to Choose Water Purifier?

Water purifier removes the impurities, Right? But, do you know which one is best for you? Or, you think that every water purifier has the same working process. 

You know that water could have undesirable chemicals, gases, suspended solids, and biological contaminants. So can you take the risk of intaking such water? 

Please read the whole article to know which water purifier you need to fit at your home as the purity of water depends on the water that comes from your taps.


Buying Guide of Water Purifier

To stay healthy, you must drink pure water. Impure water may cause life-threatening diseases to you and your family. And if you think that your filter needs a checkup or it’s risky to continue drinking the same water, go for a new filter, but only after understanding the buying guidelines.

Each filter has different qualities, technologies, and pros and cons. Even after you buy a costly water purifier with lots of technologies and filters in it, you might fall ill. But why? Because the question is not of how many technologies or filters a purifier has but what is the right one even if it has only one filter.

Do not worry! We are here to help you with the buying guidelines of a water purifier. Let us discuss all your doubts in categories to avoid confusing you.

1. Technologies 

Water Purifier Technologies


Today in the market, you will find water purifiers with filters of four technologies, namely, UV, UF, MF, and RO, or you can call them types of water purifiers. 

1. RO purifiers

Reverse osmosis is a filtration technology that purifies your water by eliminating calcium, magnesium, and sodium present in the water that passes through the RO filter. To know how it eliminates all the elements and gives out pure water, you need to know the working process of the RO filter.

How does a RO filter work?

The water purifier pushes water with pressure into the left side of the two-sided membrane. The membrane has pores of 0.0001 microns. Water passes through the pores to get filtered and come out from the right side of the membrane as pure water.

Pros and cons of RO filter

  1. RO filters reduce the hardness of the water.
  2. It is said to work faster compared to other purifiers.
  3. RO reduces the TDS level of water.
  4. It is convenient and effective to use.
  1. Most RO purifiers waste 3l water to give out 1l pure water.
  2. It may lose essential minerals from water because of the purification process.
  3. It can not work without electricity.

The wastewater from RO is discharged through a separate outlet.


2. UV purifiers

The ultraviolet rays filter, kill viruses, bacteria, and germs with harmful rays. But it becomes difficult for UV filters to remove dissolved particles present in water. Therefore an external filter is attached to the UV purifiers available in the market.

Working process of UV

The purifier has a UV chamber, mostly made of stainless steel. As the water enters the chamber to get filtered, the UV rays kill all the disease-causing germs, viruses, and bacteria. 

Pros and cons of UV purifiers

  1. After the filtration process, it doesn’t change the colour and taste of water.
  2. It is cost-effective.
  3. It works fast to disinfect water.
  1. UV purifiers do not remove dissolved organic and inorganic matters.
  2. Water needs to be pre-filtered.
  3. It can not work without electricity.

You may not find storage tanks and UV light shut-off options. If someday the purifier stops working, you may start consuming impure water.


3. UF purifiers

Ultrafiltration technology is also known as gravity water purifiers. They eliminate dead germs and bacterias but don’t remove the dissolved particles. 

How does it work?

UF filters work like a tree root. It has tiny pores of 0.01 microns, which filters the water. The pores are larger, and the particles get filtered with gravity, not with electricity. 

Pros and cons of UF filters

  1. No external force is required to purify the water.
  2. No water is wasted in the process.
  3. It can work without electricity.
  1. It cannot remove the dissolved and small particles.
  2. It is not suitable for the purification of high-level TDS water.

You can move the UF filters anywhere easily as they are portable. 


4. MF purifiers

The microfiltration system purifier removes dirt and sand but can’t remove metal and salts from the water. It also has small pores of 0.22 to 0.45 microns.

Tip: If the TDS level of your water is average, that is around 300 ppm, then buy a UF+UV filter. And if the TDS level is above 300ppm, then buy RO+UF+UV filter.


2. Source of water

Source of water


Now, the second guideline is a question. What is the source of your water? Is it surface water or groundwater, or government-certified water? This question will decide how pure your drinking water is and its TDS level. 

The municipal water has a TDS level of 1 to 200 ppm, for which you can buy UF filters. And if you use groundwater, it has a 200-2000 ppm TDS level. And for which you can buy RO water purifier. 

For other sources, the TDS level is not fixed and may vary. You can either check the TDS level using a digital TDS meter or use an RO filter that purifies waters upto 2000 ppm TDS level. 


3. TDS controller or Alkaline

TDS Controller


You will find TDS or MTDS controllers in a few water purifiers. What does it do? The TDS controller is not to purify or filtrate the water. But it is only to control the TDS level of the water that comes out of the filter. 

It is a device attached to the water purifier having two inputs—one attached to the RO filter and the other to the activated carbon filter. Both the input water mix give out the perfect TDS level of water required. But the pure water from Ro is mixed with the impure to balance the TDS level. 

Now, alkaline technology, on the other hand, is to neutralize the acidic content in the water you get after filtering. It increases the pH level of water. The RO increases water’s acidic nature, but you can find filters in the market with Alkaline RO filters. 


4. Storage capacity


The water purifier’s storage capacity depends on the number of people in your family. If two to four members live with you, 5-8 litres of storage capacity is enough. And if there are 4 to 8 people, you may need 8 to 10 litres of capacity, and for six or more people, 10 litres is perfect.


5. Cost


The price of an electrical water purifier varies from Rs. 6000 to Rs. 20,000. A UF filter that is not electric is cheaper, ranging from Rs. 1000 to Rs. 5000. But you can not use a UF filter based on its cost because if the TDS level of water at your home is high, then UF won’t work to lessen it.


Frequently Asked Questions

Q1. What is hard or soft water?

Hard water has high concentrations of calcium and magnesium. It is safe to drink but only when it has an ideal TDS level. And soft water has no dissolved salts. It is mostly free of all the minerals which are safe to drink but will not provide you with enough benefits.


Q2. Are the water purifiers noisy?

No, just a few filters make noise because of the functions of water processing inside it. Otherwise, the sound may only come because of any dysfunctionality. 


Q3. Can you reuse the wastewater of the RO filter?

Yes, you can use the wastewater for all purposes other than drinking. You can wash your car or utensils, water your plants or mop the floor using it.


Also Read:

How To Clean Water Purifiers?

Tips To Maintain Your RO Water Purifier At Home

Do Water Purifiers Work On Saltwater?



You must choose a water purifier according to your source of water, the storage capacity of the water purifier you have decided to buy. And which type is it or does it contain a TDS controller or alkaline system, and if it is affordable for you or not. 

The article has discussed all the points in detail. And we hope you enjoyed reading it and got all the information required to buy the best water purifier not to harm your health. 

If you are satisfied with the information, we have provided you, share your experience with us in the comment section below. 

Founder at Best Indian | Website | + posts

I am tech writer who is passionate about technology and spearheads the core writing team on tech news

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