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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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4.2 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
A lot of fun for dogs
Color: Multi Squeaker Balls, Size: Large, Style: 4-Pack, Color: Multi Squeaker Balls, Size: Large, Style: 4-Pack
My dogs love it a lot. Balls don't fall off the balcony - good size. Great sound which catches dogs attention . Colorful . Good quality.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
👍🏼
Color: Multi Squeaker Balls, Size: Medium, Style: 4-Pack
This dog squeak ball has been a big hit in my home and keeps my dog entertained for long periods of time. The squeaker really grabs their attention and encourages play, tapping into their natural instincts to chase and fetch.
My dog especially loves how it bounces and squeaks, making it perfect for both indoor and outdoor play. It’s lightweight and easy for them to carry around, even for quick games of fetch in the yard.
In terms of durability, it has held up pretty well so far. The squeaker may not last forever with heavy use, but the ball itself still stays in good shape. Overall, it’s a fun, engaging toy that keeps my dog active and happy.
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Reviewed in the United States on April 29, 2026
★★★★★ 4
budget friendly for dogs who lose balls in the creek
Color: Multi Squeaker Balls, Size: Medium, Style: 4-Pack
Not great quality, but works for our needs. I have a ball crazy lab. She loves for me to throw a ball using the Chuck-it Ball Launcher. We do this in our wide back yard that butts up to a creek. At some point during her run and fetch, she will take a quick detour right into the creek. She nearly always still has the ball, but once in awhile it is lost. Not wanting to chance it on more pricy (and more durable) balls, I get these or something like these. They dont cost much, yet they do the job. I' not upset if one gets sacrificed to the creek waters and mud.
Since the balls end up getting wet often, they will kinda fall apart over time (chasing, kicking, throwing, retrieving, dog saliva etc). But she doesn't chew on them. Glad she doesnt as tennis balls arent good on teeth, but even if it was ok, the balls probably would be breached easily.
SO get these if you are like me and want a ball that does the job but arent a total financial loss if get lost or destroyed. For indoor play we and by we I mean our 3 dogs demand that we use the rubbery max glow chuck-it ball. And will ignore this style ball.
Yes, I am well trained. lol
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Reviewed in the United States on November 11, 2024
★★★★★ 1
These balls SUCK! External squeakers, minimal bounce and blue that is too dark.
Color: Multi Squeaker Balls, Size: X-Small, Style: 8-Pack
We have 2 little dogs in our home - a 1.5 year old Pomsky, and a 9 year old Pekingese. My Peke has shown no interest in tennis balls for years, until today! Imagine my excitement! Until she promptly destroyed the first squeaker on one of the blue balls. When I removed it, she began peeling the logos off the ball, and then started tearing the fuzz off! My dog has never destroyed any toy in her life, so this was shocking! Then the Pomsky decided that she wanted to play fetch with the new balls - she has Golden Retriever energy - and decided to destroy a squeaker in the midst of playing! She also wasn't nearly as interested in these tennis balls as her other tennis balls that she inherited from my Peke.
1. STUPID design, with the squeakers sticking out of the balls (the don't sit flush), so they are asking to get chewed or pulled out by any dog, even elderly 10 lb dogs! And a 9 lb young adult.
2. They are difficult to squeak compared to their Kong tennis balls, hence why the Pomsky wasn't interested for long.
3. They don't bounce as much as the Kong tennis balls, either, which made them less than exciting for the athletic and agile Pomsky.
Meh. We wanted to get the smallest tennis balls we could get (1.5 inch) because neither dog will play with the 2 inch or bigger ones, but we also wanted to get colors they could easily see! The Pomsky clearly prefers the yellow balls to any other color (red, orange, green, darker blue, watermelon design), so we wanted to get like a bright blue or turquoise couple of balls to appeal to them! Well, my senior Peke liked the blue ones the most, but also liked the red and orange. Pomsky didn't like the blue ones. I think they're too dark of a blue to be easily seen in our home afternoons and evenings in the winter.
We love Outward Hound toys in our house, but these were an expensive FLOP. They are the right size, but WHY did they put the squeakers so visible and appealing to dogs? I've never seen the squeaker in the Kong tennis balls.
My advice is that Kong seems to make the best tennis balls for toy breeds, in the 1.5" size. Outward Hound dropped the ball here... no pun intended. The blue is darker than the photos depict (may be better in natural sunlight outdoors), the squeakers are external, and they barely bounce at all. Our next step will be to get the pressurized bright blue tennis balls from another brand, in hopes that the bounce and visibility will outweigh the lack of squeakiness. If those don't work, I guess we'll stick to the classic neon yellow Kong tennis balls! At my local Target, they only have multicolor packs of them, and the dark blue, red and green get completely ignored.
*Dogs can only see shades of blues, yellows and black, grey and white. While some dogs may not seem to care about color, our Pomsky clearly does. :(
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Reviewed in the United States on December 21, 2023
★★★★★ 5
My Dog Loves Them
Color: Multi Squeaker Balls, Size: Small, Style: 8-Pack
These cute little squeaky balls are the perfect size for my Shih Tzu. She loves to chew on them and make them squeak all the time, so they are durable. I would purchase them again.
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Reviewed in the United States on May 16, 2026