Reverse Osmosis is a process where water molecules are forced through a 0.0001 micron semi permeable membrane by water pressure. A line of TFC – (Thin Film Composite) sheets are skillfully sandwiched together and rolled up around a hollow central tube in a spiral fashion. The sizes of these tubes depend on the quantity of water to be processed. The reverse osmosis process of purification is mainly meant to reduce the ‘salt content’ from the water.