Reverse Osmosis (RO) involves water being forced under pressure through a semipermeable membrane. Temporary and permanent hardness , Total Dissolved Soilds (TDS), Microorganisims and other bio germs contained in water are captured while the water is passed through the membrane.
Some Standard Membranes: Filmtec Membrane, Hydronatics Membrane and Koch Membrane.
The RO is generally used for Desalination of seawater and brackish water for its conversion...