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. Application area such as, food processing, bottleddrinking water, home use drinking water, power stations, electronic industries, cosmetics production, pharmaceuticals factories,and medical treatment(such as hemodialysis). It is a key equipment for pure water plant and ultrapure water equipment.