The reverse osmosis device is an equipment to purify the saline water under the action of pressure difference of semi permeable membrane. It is called reverse osmosis, as it is counter to natural penetration direction. Different materials have different osmotic pressures. The reverse osmosis method to adopt larger osmotic pressures id used to obtain the purpose to separate, extract purify and condense.

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