... the active carbon filter and softener filter. The above device compose the consummate pretreatment system. The water which ... The reverse osmosis water purifier work principle.3.1 Disinfectant-adding deviceCoagulation devices, add coagulating agent (aluminum sulfate) before ... should be backflushed every week.3.4The RO device.The RO device removes the hydronium, organic substance, colloid, bacteria ...