Reverse Osmosis (RO) is a filtration method that removes many types of large molecules and ions from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side. To be "selective," this membrane should not allow large molecules or ions through the pores (holes), but should allow smaller components of the solution (such as the solvent) to pass freely.

The aim of the treatment by reverse osmosis is reduction of 95 - 98% of dissolved salts and removal of bacterial charge from clear (filtered) water.

Also many dissolved solids are diffused through the membranes in the lower concentration side. The process of RO allows the water purification and dissolved solids concentration operations without any change in status and with a low consumption of energy. Depending on the stage of recovery we recover water from 70-92%.