The function of semi-permeable membranes:

The knowledge about semi-permeable membranes is applied for various purposes. We know that a semi-permeable membrane is capable of separating substances when a driving force is applied across it. Artificially synthesized semi-permeable membranes are used for the separation of bacteria from viruses because bacteria cannot cross a semi-permeable membrane. In advanced water treatment technologies, membrane-based filtration systems are used. Semi-permeable membranes efficiently separate salts from water under pressure.