SKU: 11685248704

2.5"x21" | 300 GPD | 99.6% Salt Rejection | Watermaker Seawater RO Membrane | Applied Membranes

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Description

2.5"x21" | 300 GPD | 99.6% Salt Rejection | Watermaker Seawater RO Membrane | Applied MembranesAMI 2. 5x21 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 2.5x21 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 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:

  • Convert seawater into drinking water on yachts, boats, cruise ships, off-shore platforms, and resorts
  • High Rejection & Flow Rate
  • Manufactured in ISO 9001:2015 Certified Facilities
  • 100% Performance and Quality Tested
  • High Quality for Consistent and Reliable Performance
  • Uses the most advanced membrane film technology and manufacturing processes
  • Industry Standard 2.5"x21" dimensions to fit in commonly available housings.

M-S2521A Specifications

AMI Model Number M-S2521A
Size (Approximate): 2.5" Dia. x 21"L
Flow Rate: 300 gpd (1.14 m³/d)
Applied Pressure: 800 psig (55 bar)
Stabilized Salt Rejection: 99.6%
Minimize Salt Rejection: 99.4%
Single ELement Recovery: 4%
Exterior: Hard Shell Fiberglass
Membrane Type:
 Polyamide Thin-Film
Composite
Can Replace Models:





 DOW SW30-2521
DuPont SW30-2521
FilmTec SW30-2521
Spectra FT-MB-20
Katadyn FT-MB-20
Most industry-Standard 2.5x21 Seawater RO Elements
For Use in Systems:










 Watermakers or marine systems using 2.5x21 SWRO Membranes

Katadyn Spectra Systems:
Ventura 150, 150c
Ventura 200T, 200c
Catalina 340c Compact
Cape Horn Extreme 330 Compact
Newport 400c Compact
Aquifer 150
Aquifer 200
Aquifer 360

Permeate flow and salt rejection based: 32,000 ppm NaCl feed stream, 77°F, and pressure and recovery listed above. Element Permeate flow may vary +/- 20%

Operating Limits for M-S2521A

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 1,000 psig (69 bar)
Maximum Pressure Drop: 15 psig (1 bar)
Maximum Feed Flow Rate: 6 gpm (1.4m³/h)
pH Range, Continuous Operation: 2-11
pH Range, Short-Term Cleaning: 1-13
Maximum Feed Silt Density Index: SDI 5
Fere Clorine Tolerance: 0

Related Products for use with M-S2521A Seawater Elements

PRO-2.5-1200-EP-21 2.5x21 Fiberglass Membrane Housing for Seawater RO Membranes (Water Maker Pressure Vessel)
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 Membrane Elements:

  • Seawater Desalination
  • Marine Applications
  • Watermaker RO Systems
  • Yachts

Physical Dimensions of AMI M-S2521A SWRO

INCHES (MM)
L 21.0 (533)
I 19.0 (480)
D 2.4 (6.1)
P 0.75 (1.9)

Replacement Compatibility for AMI 25x21 SWRO Membranes

AMI 2.5" x 21" membrane elements can be used as direct replacements for DOW FilmTec DuPont SW30-2521, Katadyn Spectra FT-MB-20, and most industry-standard 2.5" x 21" seawater RO membranes, in SWRO systems using these elements. Some common systems using these elements are:

  • Spectra Ventura 150
  • Spectra Ventura 150C
  • Spectra Ventura 200T
  • Spectra Ventura 200c
  • Spectra Catalina 340c Compact
  • Spectra Cape Horn Extreme 330 Compact
  • Spectra Newport 400c Compact
  • Spectra Aquifer 150
  • Spectra Aquifer 200
  • Spectra Aquifer 200 Expedition
  • Spectra Aquifer 200 Power Pack Solar
  • Spectra Aquifer 360
  • Katadyn Ventura 150
  • Katadyn Ventura 150C
  • Katadyn Ventura 200T
  • Katadyn Ventura 200c
  • Katadyn Catalina 340c Compact
  • Katadyn Cape Horn Extreme 330 Compact
  • Katadyn Newport 400c Compact
  • Katadyn Aquifer 150
  • Katadyn Aquifer 200
  • Katadyn Aquifer 200 Expedition
  • Katadyn Aquifer 200 Power Pack Solar
  • Katadyn Aquifer 360
  • VT-150-12, VT-150-24
  • VT-150c-12, VT-150c-24
  • VT-200-T-12, VT-200-T-24, Ventura 200T Deluxe
  • VT-200-12, VT-200-24, VT-200c-12, VT-200c-24
  • CH-330S-12, CH-330S-24
  • NP-400cS-12, NP-400cS-24
  • AF-150-DC-12, AF-150-DC-24
  • AF-200-DC-12, AF-200-DC-24, AF-150-EX-24, AF-200-PPS
  • Flight Ready Aquifer 360, AF-360-DC-12, AF-360-DC-24

If you do not see your system listed or wish to learn more about compatibility, please contact us. Our certified water treatment experts will be happy to discuss your application. To ensure prompt and accurate information, please include as much information about your system as possible, such as: model, manufacturer, model of membranes being replaced, any available. product manuals or literature associated with your system, and photographs of your system or membranes.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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
SKU: 11685248704

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Dani
Fort Morgan, US
★★★★★ 3
real good
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This was a solid read for the ABO universe. The characters are great. The smut scenes were well written. And the town is so cute I want to go there. It didn’t have much character development it just felt like I was getting to the characters as they were getting to know each other.
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Reviewed in the United States on April 27, 2025
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Alexandria, US
★★★★★ 5
So sweet
Format: Kindle
It’s so unexpectedly sweet that it sneaks up on you. Each character is so unique and charming. I love the openness and honesty among their pack. It really blows me away how wonderful this omegaverse trope plays out. I received a free copy of this book and am voluntarily leaving a review.
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Reviewed in the United States on March 21, 2026
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Queen of Anxiety
Waukegan, US
★★★★★ 2
Needs editing
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Cute storyline and promising characters, but the lack of editing is painful to read. I would love to read an edited version.
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Reviewed in the United States on April 10, 2025
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Trouble In FL
Belleville, US
★★★★★ 5
Fantastic writing and non-stop action
Format: Kindle
This is a promising, fantastic beginning to what will be a 4-book series. Some readers may be content to read only the first 2 books, but I think you'll find that the story is so good that you'll want to keep reading books 3 and 4. Book 1 is about omega Elvana's introduction to the "Starling" brothers and their search for another missing person, Kelly. It's a bit of a rocky start, with deception and betrayal a key element. Hardly an auspicious beginning. Each member has their own path and purpose in the pack. Their interactions and the resulting narrative are so well-written that I found it difficult to put down. There is a cliffhanger that will have you reaching for book 2 as you finish, so make sure you have it on hand.
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Reviewed in the United States on September 27, 2023
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rilakk
Battle Creek, US
★★★★★ 4
Fun read
Format: Kindle
I'm not really into mafia books but I love Roxy Collin's other series so I decided to give it a try. It had the same great romance, spice, swoon-worthy characters and exciting plot that are her signature. Arben was my favorite, although it was a bit sudden how quickly he changed from ignoring her to wanting to be pack. There were almost too many twists/layers of lies to keep track of but I'm looking forward to reading the other books. The only thing that detracted from the story for me was the need for a bit more proofreading. It was mentioned that Kelly is a female and male at different points, leading me to think she changed her mind at some point about the character's gender but didn't go back and edit it to align in all places. Like another reviewer pointed out, step siblings are different than half siblings. They are incorrectly referred to as step siblings because they (allegedly) share the same biological dad. There are a few other typos as well but those aren't a big deal.
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Reviewed in the United States on March 18, 2025

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