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Top Rated 4"x21" | 800 Gpd | 99.6% Salt Rejection | Watermaker Seawater Ro Membrane | Applied Membranes Essentials [PDYwWnQI]

$65.99 $211.99 -69%

High-Performance Seawater RO Membrane for Watermakers The AMI 4x21 Seawater Desalination Reverse Osmosis Membranes are designed for exceptional seawater desalination, providing you with pure, fresh water wherever you are. With a salt rejection rate o

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Top Rated 4"x21" | 800 Gpd | 99.6% Salt Rejection | Watermaker Seawater Ro Membrane | Applied Membranes Essentials [PDYwWnQI]

High-Performance Seawater RO Membrane for Watermakers

The AMI 4x21 Seawater Desalination Reverse Osmosis Membranes are designed for exceptional seawater desalination, providing you with pure, fresh water wherever you are. With a salt rejection rate of 99.6%, these membranes ensure the highest quality water output. Ideal for marine applications, they are a perfect fit for watermakers, land-based desalinators, and sea-based desalinators. AMI's commitment to quality is evident in their 100% quality and performance-tested membranes, which are proudly made in the USA in an ISO 9001:2015 Certified Facility. Upgrade your watermaker system with these high-rejection and high-productivity membranes and enjoy clean, safe drinking water on the go.

Technical Specifications and Features

The M-S4021A Seawater RO Membranes offer impressive technical specifications, including a flow rate of 800 gallons per day (GPD) and an applied pressure of 800 psig (55 bar). With a stabilized salt rejection rate of 99.6% and a minimum salt rejection rate of 99.4%, these membranes are designed to maximize water purity. The exterior of these membranes is made of hard shell fiberglass, while the membrane type is a polyamide thin-film composite. Key features include:
  • High Rejection & Flow Rate
  • Made in the USA
  • ISO 9001:2015 Certified
  • 100% Performance and Quality Tested
These specifications make the M-S4021A a reliable choice for your watermaker filter system.

Practical Applications and Benefits

The AMI Seawater Desalination RO Membranes are versatile and suitable for a wide range of applications. They can be used to convert seawater into drinking water on yachts, boats, cruise ships, off-shore platforms, and resorts. Enjoy the following benefits:
  • High-quality drinking water from seawater
  • Consistent and reliable performance
  • Advanced membrane film technology and manufacturing processes
  • Standard dimensions to fit commonly available housings
These membranes are perfect for anyone looking to provide their vessel or facility with a continuous supply of fresh, potable water.

What Our Customers Say

January 25, 2026

Absolutely no complaints!

This is a fantastic product.

- Saylor O..

January 25, 2026

Absolutely no complaints!

The build is exceptionally solid.

- Fatima C..

January 25, 2026

Absolutely no complaints!

This is a really good gadget.

- Holli P..

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