RO system is raw water through precision filter, granular activated carbon filters, activated carbon filters, compression, and then through the pump pressure, the use of reverse osmosis membrane pore size 1/10000μm make a higher concentration of water into low concentration of water, while the industrial pollutants, heavy metals, bacteria, viruses and other impurities in the water mixed with a large number of full isolation, to achieve the required physical and chemical indicators for drinking and hygiene standards, outputs to clean pure water is the best choice of body replenish water quality. It is key equipment of pure water plant.