The single-stage reverse osmosis equipment uses the permeability characteristics of the reverse osmosis membrane to apply pressure on the water supply in a certain way to separate the concentrated water from the purified water. Since the membrane pore diameter of the reverse osmosis membrane is only 0.0001 μm， it can effectively remove the dissolved salts, colloids microorganisms, organics, etc. in the water. It is widely used for the preparation of finished water purification in factories and mining enterprises, government institutions, high-grade aquaculture and so on.