The Water Company supplies high-quality reverse osmosis (RO) membrane elements for domestic, commercial and industrial water purification systems. Our range includes Vontron membrane elements in various sizes and performance specifications to suit different feed-water conditions, production requirements and water treatment applications.

Reverse osmosis membranes use a semi-permeable membrane to separate water from a large proportion of dissolved salts and other impurities. The treated water, known as permeate, passes through the membrane, while a concentrated reject stream carries away retained dissolved substances.

Choosing the correct membrane is essential for achieving the required water quality, production capacity and operating efficiency. The right selection depends on feed-water quality, salinity, temperature, operating pressure, recovery rate and system design.

How to choose the correct RO membrane:

Before purchasing a replacement or specifying a new membrane, consider:

Membrane dimensions: Confirm the correct size, such as 1812, 2540, 4021, 4040 or 8040, and check compatibility with the membrane housing.

Feed-water quality: Assess TDS, salinity, hardness, pH, temperature, turbidity and other relevant water-quality parameters.

Required production rate: Compare the membrane’s rated permeate flow with the system’s actual operating conditions.

Salt rejection: Check the manufacturer’s specified rejection performance and testing conditions.

Operating pressure: Ensure the selected membrane is suitable for the system’s available pressure and feed-water characteristics.

Water source: Choose a membrane designed for the relevant application, such as low-salinity groundwater, brackish water or seawater.

Pre-treatment: Ensure the feed water is adequately treated to protect the membrane from fouling, scaling and chemical damage.

Replacement compatibility: Verify the model, dimensions, end connections and operating limits before replacing an existing element.

Protecting your RO membranes:

Correct pre-treatment and maintenance help maintain membrane performance and extend service life. Depending on the incoming water, treatment may include sediment filtration, activated carbon where appropriate, water softening or antiscalant dosing.

Antiscalant selection and dosing should be based on feed-water chemistry, membrane specifications, system recovery and the chemical manufacturer’s recommendations. Membranes must also be protected from incompatible chemicals, excessive pressure drop and operation outside their specified limits. Follow the membrane manufacturer’s cleaning and preservation instructions.

Why choose The Water Company?

The Water Company supplies reverse osmosis membranes, membrane housings, pre-filtration equipment, filter media, chemical dosing products and other components for water purification systems.

Whether you need a replacement membrane for a domestic purifier or elements for a commercial or industrial RO plant, browse our Membrane Elements category to find a suitable option for your application.

If you are unsure which membrane to select, contact our team with your existing membrane model, water analysis, required production capacity and system operating details.