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Description
4"x21" | 800 GPD | 99.6% Salt Rejection | Watermaker Seawater RO Membrane | Applied MembranesAMI 4x21 Seawater Desalination Reverse Osmosis Membranes For Watermakers and Land and Sea Based Seawater Desalinators Highest Salt Rejection Seawater RO Watermaker Membranes AMI high rejection and high productivity seawater reverse osmosis membranes are specially designed for marine applications. AMI SWRO membranes are ideal for seawater desalination in shipboard applications, watermakers, land based desalinators and sea based desalinators. AMI
AMI 4x21 Seawater Desalination Reverse Osmosis Membranes
For Watermakers and Land-and-Sea Based Seawater Desalinators
Highest Salt Rejection Seawater RO Watermaker MembranesAMI high rejection and high productivity seawater reverse osmosis membranes are specially designed for marine applications. AMI SWRO membranes are ideal for seawater desalination in shipboard applications, watermakers, land-based desalinators and sea-based desalinators. AMI Membranes are 100% Quality and Performance Tested in their ISO 9001:2015 Certified Facilities. Looking for a replacement seawater desalination membrane element for your watermaker filter system? View our Watermaker Replacement Membrane Chart. Benefits of AMI Seawater Desalination RO Membranes:
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M-S4021A Specifications
Permeate flow and salt rejection based on 32,000 ppm NaCl feed stream, pressure and recovery listed above. Element Permeate flow may vary +/- 20% M-S4021A Operating Limits
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Related Products for use with M-S4021A Seawater Elements
| C-C2510-A11 | Membrane Cleaning Cartridge with Acid Cleaner to Remove Scale Buildup and Prolong Membrane Life |
| C-C2510-A22 | Membrane Cleaning Cartridge with Alkaline Cleaner to Remove Organics and Prolong Membrane Life |
| C-C2510-A88 | Membrane Preservative Cartridge for Preserving the System and Membrane During Extended Periods of Non-Operation. |
| 655139-03 | Oil Absorbing Filter Cartridge - Oil-Water Separator Replacement Cartridge, 20" Big Blue Pentair Pentek Filter |
| H-F10100CF | Plankton Filter - 10" Standard 100 Micron Spun Polypropylene Replacement Filter Cartridge |
Common Applications for AMI Seawater Watermaker Elements:
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Physical Dimensions of AMI M-S4021A SWRO Marine Element
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Life changing little screen
Size: 15.6" 1080P, Size: 15.6" 1080P
I was losing my mind trying to work from home off a single laptop screen. Secondary displays were not connecting to my computer outside of the office, IT could not figure out the issue so I was doomed to single screen anytime I worked from home. A co-worker suggested I take a look at this style of screen. I had my doubts that it would work with my lap top, and lo and behold I am back in action with a dual display. It comes with an HDMI cord option and a USB-C cord option (you do not need to buy separate cords, they are included). I used the USB-C as it also acts as a power cord to power the display. It took two seconds to hook up, and with one setting change on my lap top the display successfully extended (does not just duplicate your display, it will allow display extension as well). The image quality is more than sufficient for work (no opinion on PC gaming) and settings such as brightness were easy to adjust. It's the perfect size for use with my lap top screen, and they had plenty of additional size options. The built in stand allows two screen angles, and acts as a cover when not in use. For the price this thing is absolutely clutch, don't waste money on expensive displays - you can use this with any USB-C capable device so it can travel with you for work or fun. I will be interested to see if it has longevity, but for now I'd give this thing 10 stars if I could.
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Reviewed in the United States on February 10, 2026
★★★★★ 5
Great product for a great price
Size: 15.6" 1080P
I REALLY like this. I need 2 screens to do my job efficiently and have struggled lately when traveling. Splurged on this for myself and was really impressed. It’s nice and lightweight but feels sturdy. The image quality is good. The set up could not be easier. This is a game changer for me.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Works pretty well for a cheap monitor
Size: 15.6" 1080P
I work remote and travel, so I miss my multi monitor setup. Not anymore.
I took this on a trip with me and it was great. The stand folded over to not take up too much desk space, the cables wear just long enough, another 6” would have been great but they worked.
Quality of the screen is plenty good enough for office work, I have no gaming or artwork experience with it though.
If you need an inexpensive 2nd monitor , this works great for on the go or even for a regular desk.
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Reviewed in the United States on May 3, 2026
★★★★★ 4
Great portable second screen
Size: 15.6" 1080P
Really convenient for a second screen on the go. The display looks sharp and it’s lightweight enough to carry around easily.
Setup is simple, just plug and play. Not super bright, but works well for most uses.
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Reviewed in the United States on April 10, 2026
★★★★★ 5
Exceptional - Better than one twice the price
Size: 15.6" 1080P
I bought a different external monitor a few years ago for twice the price and it was abominable compared to this monitor. This monitor is absolutely perfect. The speakers are definitely tinny like others mentioned, so don't expect to DJ a party with this thing, but for work it's perfect since that means voices are clearer anyways. The sound just isn't as full/rounded with proper bass, but it doesn't even matter because there's also a headphone jack on the monitor, too. USB-C is a total game changer for powering and passing full audio-visual in a single port. The included cables are also a big win since getting a spare data USB-C cable can get pricey and I know the one included is guaranteed to work with this monitor. It was literally plug-and-play with my 2023 16" Macbook Pro. I could go on and on about how every detail of this monitor is perfect, like how the stand is also a screen protector cover and how light and easy it is to carry and how the little grippy feet hold it in place confidently, but my point is THIS is FINALLY the external monitor I've been looking for!!!
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Reviewed in the United States on May 26, 2026
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