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Water Purifier Buying Guide | How to Choose Best Water Purifier

Water Purifier Buying Guide

When it comes to caring for your family, it is always wise not to take impulsive decisions. Buying a water purifier might look like an easy task in hand but it is really not so. The Water Purifier that consumer buys would decide the fate of his family. It is not that we have sub standard water purifier manufacturers but the quality of water has transformed drastically over the years, that the water purifier you may buy may not suffice the need of the hour. Of the top, three things that any family member would be concerned about would be “what is the best water purifier for home or what is the best water filtration for home”.


Wikipedia explains the term Water Purification in the most simplest term. Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from contaminated water. The goal is to produce water fit for a specific purpose. Most water is disinfected for human consumption (drinking water), but water purification may also be designed for a variety of other purposes, including fulfilling the requirements of medical, pharmacological, chemical and industrial applications. The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination and the use of electromagnetic radiation such as ultraviolet light.

The factors that will help the consumer decide what kind of a water purifier system should be bought are as follows:


Water Quality

If the water supplied to your home is high in Total Dissolved Solids (TDS), hardness and salinity then RO is the best choice. RO has a semi-permeable membrane which can remove the tiniest of dissolved salt, metals and impurities. In other cases, carbon activated filters can work well.

Water Pressure

Both UV and RO filters need water supply at a good pressure. If the incoming water flow does not have sufficient pressure, the RO filter will not work optimally.


Bacteria, nitrate, dissolved pesticides, and lead are the most likely health-effecting contaminants present in water. The amount of contaminants present in water can be tested in any laboratory. If water supplied to your home is high in microbes and contaminants then a UV based RO filtration can be an intelligent choice. The UV effect irradiate the water and penetrate the cells of bacteria and viruses, destroying their ability to reproduce. These organisms fail to multiply and eventually die. The RO membrane removes these dead germs and contaminants from water and makes it fit for consumption.

To summarise,

  1.  Reverse Osmosis Purifiers (or RO Purifiers) are used for water containing high levels of TDS ranging from 500-2000 PPM.
  2. UV Purifiers are used if your water contains bacteria, virus, microorganism which causes water-borne diseases
  3. Universal Purifiers pretty much combines the different technologies like Reverse Osmosis, Ultra Violet, and Activated Carbon and gives 100% pure water
  4. Gravity Based Water Purifiers use gravity to clean water and are good for low TDS in water. They do not require electricity unlike RO, UV purifier.

The most popular option among consumers is the RO-UV and RO-UV-UF. While it is a good idea to go with the best, nothing stops us from testing our water for the basic chemical constitution. List Dose suggests that water could possibly have the following impurities:

  1. Human Waste
  2. Animal Waste
  3. Suspended Impurities
  4. Heavy Metals
  5. Hard Metals
  6. Colloids
  7. Dissolved Gases
  8. Radioactive Wastes
  9. Chemical Impurities
  10. Microorganisms

Microorganisms are perhaps the most important and deadly impurities present in water. Living organisms like algae, bacteria, protozoa and several kinds of virus like rhino-virus, echo-virus etc. can present a variety of diseases that can even be transmitted by water and are therefore called water borne diseases. Some of the water borne diseases are cholera, diarrhoea, giardia etc. The most common bacterium found in water is Escherichia Coli or e-coli and is considered to be one of the first microorganisms ever to infect water. Some of the pathogens can cause gastroenteritis and dysentery that can cause destruction on a large scale.

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