RO water purifier 1) PP/UDF/CTO/RO membrane 2) With pump 3) auto flush 4)9L capacity tank inside Ro water purifierFour stage ... reverse osmosis water filtration systemCartridge: PP, UDF,CTO, RO membraneWater tank ... micro impurities,colloid,metal,bacterials and so on,onlyleft the water molecule and dissolved oxygen,output water is purity ...