Lo ngumzobo ochaza inkqubo yeReverse Osmosis. Xa uxinzelelo lusetyenziswa kwisisombululo esigxininisiweyo, iamolekyu zamanzi zinyanzeliswa nge-membrane ye-semi-permeable kwaye ukungcola akuvumelekanga.
I-membrane ye-osmosis ebuyela emva isusa iimolekyuli ezinzima kunamanzi, ezifana nesodium, amanqanaba aphezulu elothe, iiminerali ezinyibilikileyo, kunye ne-fluoride. Ekugqibeleni, isihluzo se-post-carbon filters amanzi.