RO Membrane Elements

Puritech has a widest range of RO Membranes with the above mentioned being the top selling one. 
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Reverse Osmosis 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

Reverse Osmosis Defination

Vontron offer various RO membranes convenient for brackish water, and high flow commercial applications. We provide membranes for any commercial and industrial application from tap water membranes to nanofiltration RO membranes used to remove organics from water. Reverse osmosis (RO) is a purification technology that uses a semipermeable reverse osmosis membrane to reduce dissolved or suspended water contaminants. Therefore, a reverse osmosis (RO) membrane is the main filtering media in RO systems.

How The Reverse Osmosis Membrane Works

How a Reverse Osmosis Membrane Works?

Reverse osmosis systems work by using high pressure to force water through a semipermeable reverse osmosis membrane element. RO membranes are made of a thick polyamide film that contains tiny pores through which water can flow. RO membrane element pore sizes can vary from 0.1 to 5,000 nanometers (nm) depending on the application. The pores in the RO membrane are small enough to restrict organic compounds such as minerals and salt but allow water molecules to pass through. Reverse osmosis membranes are also porous and restrictive enough to filter out disease-causing pathogens and bacteria from water.

About Reverse Osmosis Membrane Life Expectancy

Typically RO membranes have an estimated life expectancy of 2 years. Many factors determine an RO membrane’s life expectancy, such as feed water quality and frequency of use. Methods for cleaning RO membranes are often not cost effective for residential RO systems.

About Reverse Osmosis Membrane Fouling

All reverse osmosis membranes lose their performance and foul over time. Suspended solids, microorganisms, and other particles build up on the RO membrane surface and cause fouling. Examples of suspended solids often found in feed water include oil, silica, clay, iron, sulfur, and acids. To increase the life of your RO membrane, reduce most of these suspended solids before the water enters the membrane. A 5 micron carbon prefilter cartridge will the number of suspended solids in an RO membrane.

Industrial Reverse Osmosis (RO) Membrane Elements & Parts

Feed Solution

The feed solution is the water source or processing fluid. Prior to reverse osmosis, the feed solution may have been treated with chemicals, passed through pre-filters, or even a UV system. The feed solution varies based on the source of your feed solution. 

Brine Seal

Brine seals are plastic or rubber devices that seal one end of the membrane element against the wall of the component housing. This prevents the feed solution from bypassing around the element.

Perforated Central Tube

The perforated tube in the center allows the membrane element to maintain its shape facilitates the passage of water through the parts of the RO membrane element.


The permeate is the final and desired “product” of reverse osmosis filtration. The permeate water is sometimes referred to as pure water, or simply “product” water, and usually has 95%-99% of the dissolved salts removed from it. 


The concentrate is the undesirable water that exits the membrane element. Sometimes called the “reject” water, it carries the concentrated contaminants that did not pass through the membrane.

Permeate Collection Material

Also known as a “permeate water carrier”, or “mesh spacer”, the collection material is placed between two layers of the flat sheet membrane. Constructed of a knit fabric called “tricot”, it prevents the membrane from closing itself off under pressure and facilitates the collection of permeate water.

Reverse Osmosis Membrane

Most RO membranes are thin-film composite (TFC), constructed with a thin polyamide layer atop a polyethersulfone porous layer. In conjunction with the permeate collection material, the membrane has the property of high rejection of undesired materials (like salts).

Feed Channel Spacer

Feed channel spacers are a netting material placed between the flat sheets of a reverse osmosis membrane to promote turbulence in the feed/concentrate stream. This material is referred to as “Vexar.”

Outer Wrap

When treating brackish water, your RO elements will need to have a fiberglass wrap, as higher pressures are needed. However, if treating regular feedwater, a tape outer wrap should suffice. It all depends on your needs!

View more resources to help you learn about reverse osmosis here and us today with any questions about your industrial reverse osmosis system!

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