For many years, the water supply at Red Sea for Domestic & Touristic purpose has depended upon supply by trucks from wells far away. The need to meet water demand minimums consumption of energy we had to install a Reverse Osmosis System. A peripheral, but nevertheless significant aspect concerning the environment. It was necessary to take into consideration the feed and the discharge of the reject brine in a manner that did not upset environment. South Sinai Water Company Desalination is the first large Sea water desalination plant at Sinai using the Reverse Osmosis process. The plant has been built at Naama Bay with capacity of 3.000 m3/day extended to 17.000 m3/day. The plant is located almost 1km from the sea in a touristic area. The plant was started upon 15 June 1995.