'How do I purify drinking water and what is the type of water purifier I should buy?' -- this is a question that many of you would be faced with, given the rising water-pollution levels and the increased ensuing risk of contracting water-borne diseases. In fact, many of you might be facing issues of water not purifying well and fit enough for the purpose of drinking, despite having a water purifier at home. This might be a stage when you might want to consider upgrading to a RO water purifier. But before we advise you on how to go about doing that, let's explore the concept of different methods of water purification and their suitability.

Reverse Osmosis removes dissolved solids of and above the size 0.0009-0.007 microns. It is used to remove dissolved impurities from water through the use of a semi-permeable membrane. It involves the reversal of flow through a membrane from a high salinity solution to the high purity, or permeate stream on the opposite side of the membrane. Pressure is used as the driving force for the separation. This means that through the reversal flow, RO not only removes the impurities, it also desalinises the water. It reduces the TDS of water by around 90 percent.

Reverse osmosis purifier is needed in following circumstances: