water treatment, process raw water into pure water. maked by sus304 material. automatic control. Usually, this system contains: sand filter, active carbon filter ... remains in the water, protect the RO film.4. RO system:This system contains: RO film, pressure vessel, frame, high pressure pump ... can kill the germ. 6. Ozone mixer tank:Through this system ,the ozone can mix with the water better, and kill ...