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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4.3 ★★★★★
Based on 11 reviews
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Product Reviews
J
Verified Purchase
Jean
Chelsea, US
★★★★★ 4
Base of you is very durable
Color: Blue
Overall this is a fun toy. My German Shepherd loves it. The ropes were chewed off within the first hour which was disappointing. Using it for treats did not work because the opening is so large. It has become only a chew toy and it is very durable. Since I bought this to enjoy the extra features, I am disappointed. I was able to buy three chew only toys for the same price. I still give it four stars because my dog likes it so much.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2023
T
Verified Purchase
Terri Bodker
Fort Morgan, US
★★★★★ 1
The dog will destroy the ropes and eat them be careful with this
Color: Blue
The rubber part is very durable but the strings or ropes are not. Puppy is eating the strings and having a hard time pooping them out. Just cut them off close to the knots and watch for them to eat the strings they pull off.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 12, 2022
L
Verified Purchase
lildevil35
Los Angeles, US
★★★★★ 3
Is not as durable as they say for large dogs
Color: Multi-colored
My dog loved the fact he got a new toy and he loved the toy itself. Carrying it around and shaking it, that is. The ropes are small and pop right back out of the ball. They are more for a small dog to tug on. The suction is strong but still not strong enough for a 100 lbs Rotti. He kept grabbing the eleasic ropes and pulling off the floor.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2023
S
Verified Purchase
Samantha
Cuba, US
★★★★★ 5
Even the rope is awesome!
Color: Multi-colored
The suction power on this wasn’t the greatest. Even using the sticky patch provided didn't keep it stuck to the floor. I will say though: I was terrified it would destroy the cheap flooring I put it on, but the sticky stuff didn’t harm the floor at all. The toy itself has been fantastic. My pup loves to chew on all parts of it (the ball, the suction piece, and the rope) and it’s held up against his jaws of steel. I will be purchasing another one of these once he’s finally destroyed the original (we’ve had it almost 3 months with just about daily use).
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 22, 2021
P
Verified Purchase
Peggy
San Leandro, US
★★★★★ 5
Indestructible
Color: Blue
Best dog toy for my Daschund !
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 5, 2025

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