It’s been scientifically proven that 60% of the human body is made up of water. Add to that the fact that a person needs a minimum quantity of 3 liters consumption of water per day in order to keep oneself fit. These two just go on to prove the essentiality of water for us humans. It can also be considered as one of the basic necessities i.e. food, clothing and shelter and water undoubtedly forms a part of the food component as it is a necessary element required for proper digestion of the food consumed by any person.  So, it can indisputably be deduced that without water a person would be in peril.


With the increasing population and pollution, the necessity and need for the hour, in any area of the world is more of getting hold of required amounts of water, and more so getting pure water, than just water itself. Industrial wastes, wastes from households and many other polluting elements are present in all sorts of water ranging from water for bathing, washing and even drinking water in alarming and life threatening levels.

What is a person to do under such circumstances? There is only but one solution for this problem. Getting a water purifier in order to ensure that the water one is consuming is potable, safe and will not lead to any negative consequences to his health. For this, one needs to first understand the types of purifiers available in the market, what exactly it is and how it works. By the end of this article, you’ll have a fair knowledge about the functioning and working of a simple RO purifier.

Let us first look at the basics.

What is this Reverse Osmosis?

Reverse Osmosis works on a similar theory as osmosis, but in the reverse route, wherein, external pressure (as opposed to internal pressure in osmosis) is used on the sect enclosing salty solution, then pure water is enforced out of the cell and the salt is preserved. As the water is removed from the salty solution, the concentration of the water increases along with the osmotic pressure. This process goes on till the osmotic pressure value of the left over salt solution inside the cell matches with the external pressure used.

Reverse osmosis membranes also restrain suspended contamination; such as, silt, colloidal particles and microorganisms by asset of their ultra-fine pore size. Thus, reverse osmosis membranes hold back all kinds of impurities.

How does the RO system work?

It involves a method in which dissolved inorganic solids (such as salts) are removed from a solution (such as water). This is achieved by domestic water pressure pushed through the tap water via a semi permeable membrane. The membrane (about the same thickness as an average cell phone) permits only the water to flow by, not the dirt or impurities. These go down the drain.

What influences the performance of the water purifier?

  • Pressure of water
  • Water Temperature
  • Kind and number of total dissolved solids (TDS) contained  in the water
  • The type and quality of filters and membranes attached for use in the RO System.

What are the basic components of any RO purifier? (Must be checked before zeroing in on the purchase)

  • Cold Water Line Valve
  • Pre-Filter (s)
  • Reverse Osmosis Membrane
  • Post filter (s)
  • Automatic Shut Off Valve (SOV
  • Check Valve
  • Flow Restrictor
  • Storage Tank
  • Faucet &
  • The Drain Line


Is 100% purification guaranteed?

No. None of the RO purifiers, be it any brand or company,  can guarantee a 100% purification (even if it claims so), as like any other scientific process, this has limited effectiveness .Reverse osmosis will eliminate up to 96-99% of basic ions, and 99.5+% of all other contaminations.

And, the most important of all.

Why RO?

You first need to make your mind up your mind about whether you want to go for a UV based purifier or an RO based purifier. Research indicates that UV purifiers can eliminate bacteria and viruses but not additional contaminants like nitrates, arsenic, fluorides, mercury etc., Moreover, UV filters would not lessen the quantity of total dissolved solid (TDS) in the water.  The rational and prudent decision here would be to opt for an RO purifier as it would ensure increased levels of purity in the water in comparison to a UV purifier. As, reverse osmosis membranes hold back all kinds of impurities, it is the ideal choice as a water purifier.