Reverse Osmosis (RO) membrane is water purification component that separates materials less than 0.001 μm in size such as the separation of monovalent salts from water, as practised in the desalination of seawater and brackish water.

RO membranes are typically capable of removing 90% – 99% of contaminants such as total dissolved solids (TDSs) in the water supply. The membranes are usually manufactured as a flat sheet of thin composite membranes consisting of an active polyamide layer (high permeability but impermeable to dissolved salts and particulate matter) supported by a porous polysulphone layer wound round a central collection tube.

In a water purification process, RO technology inverts the natural direction of osmotic flow by applying external pressure, such that the pure solvent (water) is forced across a semipermeable membrane toward a lesser concentrated solution. To apply the pressure necessary to reverse the natural osmotic flow of the pure solvent, RO systems can require substantial amounts of energy. This energy is commonly provided by a high-pressure pump ‘feeding’ the RO machine.


RO plant for industrial applied as: desalination of seawater and brackish water; in the production of ultrapure water for the electronic, pharmaceutical and energy production industries; decontamination systems for urban and industrial water.

For area which has large source of natural humic water or peat water, RO can be applied to produce clean water for community water supply. For high resistivity water are designed with RO in advance of deionization (DI) in order to maximize DI resin longevity. Due to its effectiveness, RO is one of the predominant technologies encountered in well-designed high purity (ultrapure) water systems.

Ultrapure water, RO applied to produce demineralization water for the application of RO as a final step of wastewater treatment for water reuse and valuable component recovery seems to be promising in wastewater reclamation.

HUI can provide you with membrane elements from most leading membrane producers.

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