Popper K, Merson R L, Camirand W M
Science. 1968 Mar 22;159(3821):1364-5. doi: 10.1126/science.159.3821.1364.
Water is separated from brines by a semipermeable membrane. Water flows by osmosis across the membrane into a sealed chamber where it creates pressure. This pressure is transmitted by a water-immiscible liquid piston to a second chamber where it effects reverse osmosis. Water-removal rates are calculated.