The membrane element is reverse osmosis, which can withstand the disinfection CIP treatment. The outer shell is made of glass fiber reinforced plastic and stainless steel. The inner wall and the used pipes are polished and passivated without dead angle and dead water area to prevent the growth of microorganisms. The valve table, seal ring and all pipelines are all equipped with German automatic welding equipment without wires. The automatic welding level reaches the design standards of hygienic level and water hammer resistance specified by FDA, and the pure water recovery rate reaches more than 80%.