Reverse osmosis (RO) is a membrane-technology filtration method that removes many types of large molecules and ions from solutions by applying pressure to the solution, when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side. To be "selective," this membrane should not allow large molecules or ions through the pores (holes), but should allow smaller components of the solution (such as the solvent) to pass freely. Reverse osmosis is used to purify Water and remove salts and other impurities in order to improve the colour, taste or properties of the fluid.
Reverse osmosis is a high-pressure energy efficient water separation process. It is a method of extracting essentially pure and fresh water from polluted or salt water by forcing the water under pressure against a semi permeable membrane, which passes the pure water molecules, but filters out salts and other dissolved impurities.
