This is a device desalinizing and purifying the salt water by semi-permeable film adopting the pressure differential. It has the reverse direction of natural osmosis, thus being called as reverse osmosis or inverse osmosis. According to the osmosis pressures of different materials, the reverse osmosis with higher osmosis pressure can be adopted to achieve the objectives of separation, extraction, purification and concentration. 

More than 97% soluble salts and 99%glues, microbe, particulate and organic substances and etc can be removed with the reverse osmosis. It becomes the most idea equipment for the modem program of pure water, hyper pure water, and airspace water. The remarkable characteristics of the equipment are shown as lower energy consumption, no pollution, simple techniques, high water quality, easy operation and maintenance.