The reverse osmosis(RO) water treatment plant is an equipment to purify water with the action of pressure difference of semi-permeable membrane. RO membranes can effectively remove the majority of organics, harmful substances, bacteria, particulates, etc in the raw water. RO system is widely used in water treatment, purification for tap water, well water, underground water, borehole salty water, brackish water and seawater, pure water and ultra-pure water production, power stations, electronic industries, cosmetics production, medicine(pharmaceuticals) manufactories, and medical treatment(such as hemodialysis). It is key equipment for the pure water plant and ultrapure water equipment.