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  • SKUM-S2521R
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AMI RO Membranes Made in USA


AMI 2.5x21 Seawater Desalination RO Membrane with Reverse-End Seal
Eco-Sistems Water-Pro S60/S90 Watermaker Seawater Desalinators

AMI M-S2521R Seawater RO Membranes can be used as replacements in Eco-Sistems Water-Pro Watermakers S60 and S90, with exceptional value and performance benefits. This high rejection and high productivity seawater reverse osmosis membrane is configured with the brine seal on the outlet end and specially designed for marine applications. AMI Membrane elements are among the finest in the industry. For the past 30 years AMI Membrane elements have earned the reputation of consistent quality. AMI Membranes are Made in the USA in their ISO 9001:2015 Certified Facility and are 100% Quality and Performance Tested.

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 
  • Made in the USA 
  • 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.
Genuine AMI Membranes ISO USA Quality

M-S2521R Specifications

AMI Model Number M-S2521R
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: 99.2%
Single ELement Recovery: 4%
Exterior: Hard Shell Fiberglass
Membrane Type:
Polyamide Thin-Film
For Use in Systems:

Eco-Sistems Water-Pro Watermakers:
Water-Pro Compact S-60
Water-Pro Modular S-60
Water-Pro Compact S-90
Water-Pro Modular S-90

S60 uses 2 membranes per system 
S90 uses 3 membranes per system

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-S2521R

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-S2521R 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 Membrane Elements:

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

Physical Dimensions of AMI M-S2521R SWRO

AMI Replacement Seawater RO Membrane for Water-Pro S60 & S90 Watermakers  
L 21.0 (533)
I 12.0  (300)
D 2.4 (6.1)
P 0.75 (1.9)


Replacement Compatibility for AMI 25x21 SWRO Membranes

AMI 2.5" x 21" reverse-seal membrane elements are configured with the brine seal on on the outlet end of the membrane, specially designed with the Eco-Sistems Water-Pro Energy Recovery Watermaker Systems.  

  • Eco-Sistems Water-Pro Compact S-60 Energy Recovery Watermaker
  • Eco-Sistems Water-Pro Modular S-60 Energy Recovery Watermaker
  • Eco-Sistems Water-Pro Compact S-90 Energy Recovery Watermaker
  • Eco-Sistems Water-Pro Modular S-90 Energy Recovery Watermaker

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.

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