Nov yog daim duab qhia txog cov txheej txheem ntawm Reverse Osmosis.Thaum lub siab yog siv rau cov tshuaj concentrated, cov dej molecules raug yuam los ntawm semi-permeable daim nyias nyias thiab cov kab mob tsis pub dhau.
Lub rov qab osmosis membrane ces tshem tawm cov molecules hnyav dua li dej, xws li sodium, siab cov hlau lead, yaj minerals, thiab fluoride.Thaum kawg, cov lim dej tom qab carbon polishes dej.