... of water filter machine: Raw water + raw water tank + raw water pump + quartz sand filter + activated carbon filter +(water softener)+(UF system)+ security filter + high pressure pump + RO system ... s/cm7) Membrane options: Dow Filmtec membrane, ESPA membrane, GE membrane, Toray membrane, Vontron membrane, etc.8) Sterilization options: ozone generator, UV sterilizer, etc. 4000L water filter machine