... bed, precision filter, water (equal to or more than 18m Omega.CM) (traditional process). (2)Pretreatment, anti penetration, intermediate water ... coarse bed, fine mixed bed, ultraviolet sterilization device, precision filter, water (equal to or more than 15m Omega.CM) ... valve of the water tank is stable; Imported haideneng ultra low pressure reverse osmosis membrane, high desalination rate, long service ...