Then, the larger molecules are passed in a lateral flow along the membrane and flushed. In RO Desalination systems, water is injected by high pressure pump into the semi-permeable membranes with tiny pores with a diameter of about 42 microns. These pores prevent the passage of molecules larger than water molecules, and thus, the permeate water is flowed from one side and the concentrated water (Brine) from the other side. Reverse osmosis can remove about 90 to 99% of all water T.D.S and colloidal material. These salts include sodium, potassium, sulfate, bicarbonate, and silicate salts, bacteria, viruses and other water soluble salts. The advantages of using a reverse osmosis system compared to other methods include the following: Economy, low power consumption, non- polluting the environment and ease of work with this device and reduced repairs and maintenance costs (Jerard et al., 1997).