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Ozmosis SW-4021 Reverse Osmosis Membrane 4″x 21″ Seawater Desalination, 800 GPD, 99.5% Salt Rejection, Made with premium quality materials Toray Brand Sheets and Dow Glue

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Ozmosis Brand 4″ x 21″ Sea-Water Membrane
Optimal Pressure 800 PSI
It’s Average GPD is 800
Salt Rejection Rate is 99.5%
Effective membrane area 33 ft

Product Overview:

Ozmosis SW-4021 Reverse Osmosis Sea-Water Membrane, this advanced technology delivers cleaner, higher quality water. It comes with 800 GPD capacity,800 psi and 99.5% salt rejection, which means that this will generate more water of higher quality while using less energy when compared to similar membranes. This Ozmosis SW-4021 Reverse Osmosis membrane is utilized for multiple applications. Fits all standards 4” x 21” membrane housings stainless steel, PVC, or fiberglass.It has a Maximum Pressure of 1000 psi, Salt rejection of 99.5%, Boron-removing rate 93%, a recovery rate of 4%, and Effective membrane area of 33 ft, Feed Spacer 28 mm. Test temperature 25℃, Max. feed flow 16 GPM. Free chlorine concentration: <0.1, Continuous running PH: 2-11, Chemical cleaning PH: 1-12. Test water concentration: 32800 ppm; test PH: 7.5. Maximum pressure drop per element: 10 psi. This membrane is made with premium quality Toray membrane sheets.

Product Features:

ANALYTICAL CAPABILITIES:  This product’s responsibilities include improving water quality by removing impurities, offering a trustworthy source of clean water, and assisting in the overall efficiency of a reverse osmosis water purification system in a variety of settings.

DUTIES RELATED TO THIS PRODUCT: The Ozmosis SW-4021 RO Reverse Osmosis Membrane reduces the worries of customers by providing cleaner, safer, and better-tasting water, lowering energy and water costs, prolonging the life of appliances, and supporting a variety of applications.

MULTIPLE APPLICATIONS: This product serves a variety of purposes and it is very flexible. In addition to providing clean drinking water for homes, it improves the water quality in commercial settings, helps with spot-free car washing, makes sure that agriculture is effective and supports industrial processes as well.

LOW-MAINTENANCE: The membrane’s durability and low maintenance requirements help to lower the overall cost of maintenance. Meanwhile, the SW-4021 membrane’s minimal maintenance features are a result of its durable design, effective filtering and chemical cleaning ability.

ENVIRONMENTAL SUSTAINABILITY: This RO Membrane prioritizes sustainability in material sourcing and manufacturing. Moreover, it utilizes renewable energy and minimizes waste, ensuring everyone receives leading performance while contributing to a greener future.

LONG-LASTING QUALITY: Made with premium Toray brand sheets, renowned for their durability, and Dow glue, ensuring a reliable seal. Enjoy years of dependable filtration.

The Ozmosis SW-4021 Reverse Osmosis Sea-Water Membrane is an excellent alternative for a dependable and effective water filtering system. This advanced membrane surpasses expectations by delivering superior filtration with lower energy consumption. Perfect for residential and commercial applications, the Ozmosis SW-4021 ensures peace of mind with its long-lasting durability. Experience noticeably improved water quality, with a salt rejection rate of up to 99.5% of dissolved solids and impurities. Its operation makes it an economical choice for reducing your water filtration energy costs.

Additional information





Average Production

800 GPD

Operating pressure

800 PSI

Max Pressure

1000 psi

Salt Rejection


Boron Removal Rate


Continuous running water PH range



Toray membrane sheet

Recovery rate

4 %

Feed Spacer

28 mm

Chemical cleaning water PH range



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