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Water from any natural source is usually heavily contaminated. Wells, rivers, or reservoirs-drinking water directly, without filtering it in a water purifier, can cause many ailments. Even tap water, which is said to be treated before reaching you, is found to have many contaminants. Hence it becomes imperative that you use a trusted and reputed water purifier to purify the water you consume.

Water purifiers in India, come in an array of types and brands, each one claiming to be the best. Before you settle for a water purifier though, it is essential to understand what kind of filtering systems they provide and also how effective each is. Only then can you make an informed decision before buying.

Water purifiers are generally classified into five basic types.

Distillation Type - These water purifier distill water i.e. water is allowed to boil and vapors are collected to give you pure drinking water. This process successfully removes contaminants, sediments and microorganisms. The disadvantage of such ro water purifier is that it is very slow and gives approximately only one liter to every ten liters filtered. Also, the distillation process doesn't allow oxygen to pass through, thereby reducing the quality of water.

Activated Carbon Type - These types of water filters use carbon particles to filter water. The contaminants and sediments in water stick to carbon surfaces, and you get clean water. It also effectively removes any odor that may be present. The disadvantage of this filter is that it cannot kill the microorganisms present in the water.

Backwash type - Water is passed through a purifying medium, which traps sediments, residue and contaminants. Many types of purifying cartridges are available in the market. The downside of this type is again, that it doesn't kill harmful microorganisms.

Reverse Osmosis purifiers - RO as it is called, was initially developed to desalinate seawater. Water is passed through a semi permeable membrane so that only single molecules can pass through. This process effectively removes contaminants in water, although small microorganisms may escape through.

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