The currently emerging method which is gaining ground for producing fresh water form the sea water or brackish water is by the Reverse Osmosis (RO) process.
In the RO process water at high pressure passes through very fine membranes that allow only the water molecules to pass through.
The plant basically consists of two phases. The first phase is a pre treatment plant. Here the :
1.Filtration and coagulation removes the solids and suspended particles.
2.Chlorination and other chemicals removes the biological organisms.