Water Purifier Buying Guide - Choose the best water purifier

Water purifiers are one of the most important household items that play a significant role in protecting the health of your family. A good water purifier can provide safety from life threatening waterborne diseases that may be caused by ingesting contaminated water at home. 

You can follow our easy to understand water purifier buying guide to narrow down to the perfect water purifier that suits your needs and budget. 

A. Types of water purifiers

Though there is a sheer variety of water purifiers available in the market, these are majorly classified into three categories based on their functions. These are:

Gravity water purifier:

  • uses pressure filtration
  • non electric
  • portable 

UV water purifier

  • uses ultraviolet rays for operation
  • fast
  • do not remove sterilized micro organisms, dissolved organic and inorganic particles

RO water purifier 

  • effective
  • fast
  • reduces hardness of water 

B. What is your source of water ?

In India, especially in the metro cities, water reaches our homes via three major sources : 

  • Municipal Water : this is the water that reaches our home via lakes, rivers or other municipal sources. This water type has TDS between 1 to 200 ppm. 
  • Ground Water : If the water source is tube well or bore well, it will have TDS ranging from 200 to 2000 ppm . 
  • Multiple Sources : If the water supplied to your area is from multiple sources, such as municipal and tube well or tanker then your level of TDS will vary every day. 

C. Which water purifier should I choose ?

First, you should know the source and quality of the water - hardness, salinity, and TDS - of the water supplied to your area before knowing what type of water purifier you need. 

What is TDS in water and how is considers as acceptable for drinking ?

TDS - total dissolved solids, is used to describe the inorganic salts and small amounts of organic matter that are present in solution of water. The principal constituents in TDS are usually calcium, megnesium, sodium, and potassium cations and carbonate, hydrogen carbonate, chloride, sulfate, and nitrate anions. TDS is usually measured in mg/liter or ppm (part per million). You can get your water tested in the lab or use a TDS meter that can be availed from nearby or online stores. 

Usually, if the water's TDS is below 200 ppm, it is considered to be very good for drinking. However, you might still want to get it purified to remove harmful bacteria and viruses. Ground water usually has TDS level of anywhere between 200 ppm to 3000 ppm, and you would need an RO water purifier to clean such water. 

Which is the best type of water purifier for me according to the TDS ?

Once you have TDS value, select the water purifier that is best suited for the water type.

  • 50 to 200 PPM : UF, UV, UF + UV water purifier
  • 200 to 500 PPM : RO, RO + UV water purifier
  • Above 1000 PPM : RO, RO + UV water purifier 

D. Consider the water purifiers storage tank capacity 

After you have decided on the type of water purifier that suits your needs and drinking water supply, you will have to figure out the water storage you will need. Each person in the family usually cosumes anywhere between 2 and 4 litres of water every day. So, you should calculate the amount of filtered water that you would need in one go. 

  •  1 to 2 person : 4 to 5 litres
  • 3 to 4 person : 6 to 8 litres 
  • 5 to 8 person : 10 litres and above 


E. Do you need a hot and cold water facility in your water purifier ? 

Some water purifiers can offer hot and cold water after the purification process. You can drink cold water directly out of the water purifier, and the hot water can be used to cclean cereals, fruits, vegetables, and other edible thnigs. However, such water purifiers cost more and are usually found in the high end segment. 

F. Electricity or non electricity water purifiers

With water purifiers, there are cheaper non electric versions and fancy electric ones tool. Non electric water purifiers will remove impurities as well depending on the technology being used. Some offer UF technology, sediment filteration as well as carbon filtration to remove odour and smell and chlorine. 

Electric purifiers work mostly on dissolved solids, viruses and bacterias, which are mostly present in water that comes in an urban area. 


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