Reverse osmosis is a filtration process that is often used for water. It works by using pressure to force a solution through a membrane, retaining the solute on one side and allowing the pure solvent to pass to the other side. This is the reverse of the normal osmosis process, which is the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration when no external pressure is applied.


A video on reverse osmosis. (PS:please see the video starting from 50 seconds as the first 50 seconds was really boring...)





This is another video on water filtration methods and they say you have to turn on your computer sound to hear it clearly. Actually, there is no need as the video has words on it which is roughly what the person is trying to talk about. :D enjoy~