Reverse osmosis ke thekenoloji ea karohano ea membrane e ntlafalitsoeng ka bo-1980, eo haholo-holo e sebelisang molao-motheo oa semipermeable membrane, e sebelisa khatello ho tharollo e tsepamisitsoeng ts'ebetsong ea osmosis, ka hona e sitisa phallo ea tlhaho ea osmotic. Ka lebaka leo, metsi a qala ho phalla ho tloha ho metsi a mangata ho ea ho mokelikeli o fokolang haholo. RO e loketse libaka tse phahameng tsa letsoai la metsi a tala 'me ka katleho e tlosa mefuta eohle ea letsoai le litšila metsing.