2.5"x40" | 700 GPD | 99.6% Salt Rejection | Watermaker Seawater RO Membrane | Applied Membranes

In Stock for Immediate Shipment.
was $353.00 Special Price $230.00
More Information

AMI 2.5x40 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 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.

Specifications for SWRO Membranes for Watermakers

Benefits of AMI Seawater Desalination RO Membranes:

  • Convert seawater into drinking water on yachts, boats, cruise ships, off-shore platforms, and resorts
  • Highest Rejection & High 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
  • Standard dimensions to fit in commonly available housings
Genuine AMI Membranes ISO USA Quality

Specifications for M-S2540A

AMI Model Number M-S2540A
Can Replace Models:

DOW SW30-2540
DuPont SW30-2540
FilmTec SW30-2540
Spectra FT-MB-40,
Katadyn FT-MB-40,
Most industry-Standard 2.5x40 Seawater RO Elements
Size (Approximate): 2.5" Dia. x 40"L
Flow Rate: 700 gpd (2.65 m³/d)
Applied Pressure: 800 psig (55 bar)
Stabilized Salt Rejection: 99.6%
Minimize Salt Rejection: 99.4%
Single Element Recovery: 8%
Exterior: Hard Shell Fiberglass
Membrane Type:
Polyamide Thin-Film
For Use in Systems:

Watermakers or marine systems using 2.5x40 SWRO Membranes

Katadyn Spectra Systems:
Catalina 340c
Bimini 300c
Cape Horn Extreme 330
Newport 400c
Newport 700c
Newport 1000c
Monterey 1000

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

Operating Limits for M-S2540A

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-S2540A Seawater Elements

PRO-2.5-1200-EP-1 2.5x40 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 Watermaker Elements:

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

Physical Dimensions of AMI M-S2540A SWRO Marine Element

Reverse Osmosis Membrane for Watermakers and Seawater Desalination  
L 40.0 (1016)
I 38.0  (960)
D 2.4 (61)
P 0.75 (19)

Replacement Compatibility for AMI 2.5 x 40 SWRO Membranes

AMI 2540 membrane elements are may be used as direct replacements for most industry-standard 2.5" x 40"  seawater Membrane elements, including:  DOW FilmTec SW30-2540, Katadyn Spectra FT-MB-40, and most other Industry-Standard 2.5x40 Size Seawater RO Elements - for use in any system using these membrane elements.  Some common systems using these elements are:

  • Spectra Catalina 340c
  • Spectra Bimini 300c
  • Spectra Cape Horn Extreme 330
  • Spectra Newport 400c
  • Spectra Newport 700c
  • Spectra Newport 1000c
  • Spectra Monterey 1000 (Spectra Watermakers Monterey - 1000)
  • Katadyn Catalina 340c
  • Katadyn Bimini 300c
  • Katadyn Cape Horn Extreme 330
  • Katadyn Newport 400c
  • Katadyn Newport 700c
  • Katadyn Newport 1000c
  • CT-340c-12, CT-340c-24
  • CH-330, CH-330-24
  • NP-400c-12, NP-400c-24
  • NP-700c24, NP-700c-110/12, NP700c-110/24, NP-700c-220/12, NP700c-220/24
  • NP-1000c24, NP-1000c-110/12, NP1000c-110/24, NP-1000c-220/12, NP1000c-220/24

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.