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Ozmosis Brand 4″ x 21″ Low Pressure Water Membrane
Optimal Pressure 110 PSI (90-150 PSI)
Its Average GPD 1,000
Salt Rejection Rate is 99.7%
Made of the highest quality materials including Toray Brand Sheets

Reverse Osmosis Membrane LP-4021 key to advanced water purification, designed as a direct replacement for the DOW TW30-4021 4″ x 21″ Low-Pressure Membrane, this powerful membrane stands out for its ability to deliver pristine water quality. With a generous 4″ x 21″ size, it ensures efficient filtration, making it suitable for a range of applications, from residential to industrial use.

Broad Compatibility: This LP-4021 Reverse Osmosis Membrane is a versatile replacement, compatible with Dow Filmtec LP-4021, TW30-4021, and other compatible membranes, ensuring a seamless transition.

Diverse Applications: Ideal for various applications, including car washes, irrigation, the food industry, whole-house and commercial reverse osmosis, agriculture, and industrial settings, this membrane serves a wide range of water purification needs.

Universal Fit: Designed at 4″ x 21″, it effortlessly fits into all standard 4″ x 21″ membrane housings constructed from highest quality materials including Toray Brand Sheets, PVC, or fiberglass, ensuring compatibility across systems.

Compatibility: This membrane is compatible with renowned brands such as Dow Filmtec, CSM, Toray, Hydranautics, and Axeon HF2-4021 Series, ensuring top-tier performance.

Premium Quality: Crafted with the highest quality materials, including Toray Brand Sheets and Dow Brand Glue, this membrane guarantees longevity and efficiency. Its fiberglass wound housing offers superior durability compared to plastic alternatives, ensuring reliability and robust filtration. With an average production rate of 1000 GPD, an impressive 99.7% salt rejection rate, and a 15% recovery rate, it excels in delivering purified water.

Rеvеrsе Osmosis Mеmbranе LP-4021 provеs to bе a formidablе and rеliablе altеrnativе to thе DOW TW30-4021 4″ x 21″ Low-Prеssurе Mеmbranе. This upgradе is your path to еnhancеd watеr purification, еnsuring clеanеr and safеr watеr for a multitudе of applications. With thе LP-4021, you can trust in its еfficiеnt filtration capabilitiеs and its capacity to mееt low-prеssurе watеr trеatmеnt nееds.

Additional information



Average Production

1000 GPD

Max Pressure

600 psi

Optimal Pressure

150 psi

Salt Rejection


Recovery Rate


Feed Spacer

28 mm


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