... stage reverse osmosis (positive charge anti permeation membrane), pure water tank, water pump, EDI device, an ultraviolet sterilizer, 0. ... stage reverse osmosis (positive charge anti permeation membrane), pure water tank, water pump, EDI device, an ultraviolet sterilizer, 0. ... water tank is stable; Imported haideneng ultra low pressure reverse osmosis membrane, high desalination rate, long service life ...