... treatment 1.slice sand filter 2.active carbon filter 3.sodium exchager 4.hollow fiber super filter and so on The ... series), fine filter(JML series), fibre active carbon (HML series), sodium-ion exchanger(SNJ-3), hollow fibre super-filter (CL series), ultraviolet ... , colloid, remained oxygen of microorganism and some of height-metal ion in the water; reduce the hardness of the water to ...