4"x40" | 1950 GPD | 99.6% Salt Rejection | Seawater RO Membrane | Applied Membranes
SKU: 15688111335

4"x40" | 1950 GPD | 99.6% Salt Rejection | Seawater RO Membrane | Applied Membranes

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Description

4"x40" | 1950 GPD | 99.6% Salt Rejection | Seawater RO Membrane | Applied MembranesAMI 4x40 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 4x40 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
  • Standard dimensions to fit in commonly available housings

M-S4040A Specifications

AMI Model Number M-S4040A
Can Replace Models:




 DOW SW30-4040,
DuPont SW30-4040,
FilmTec SW30-4040,
Spectra FT-MB-SW4x40,
Koch 1820SS
Industry-Standard 4x40 Size Seawater RO Elements
Size (Approximate): 4" Dia. x 40"L
Flow Rate: 1950 gpd (7.38 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
Composite
For Use in Systems:






 Watermakers or marine systems using 4x40 SWRO Membranes

Katadyn Spectra Systems:
Spectra Farallon 1800c,
Spectra Farallon 2800c,
Spectra LB 1800,
Spectra LB 4000

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-S4040A Operating Limits

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: 16 gpm (3.6m³/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-S4040A Seawater Elements

40E100-1 4x40 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-S4040A SWRO Marine Element

INCHES (MM)
L 40.0 (1016)
I 38.0 (960)
D 3.9 (99)
P 0.75 (19)

Replacement Compatibility for AMI 4 x 40 SWRO Membranes

AMI 4040 membrane elements are may be used as direct replacements for most industry-standard 4" x 40" seawater Membrane elements, including: DOW FilmTec SW30-4040, Katadyn Spectra FT-MB-SW4x40 , and most other Industry-Standard 4x40 Size Seawater RO Elements - for use in any system using these membrane elements. Some common systems using these elements are:

  • Spectra Farallon 1800c
  • Spectra Farallon 2800c
  • Spectra LandBased 1800 (Spectra LB 1800)
  • Spectra LandBased 4000 (Spectra LB 4000)
  • Katadyn Farallon 1800c
  • Katadyn Farallon 2800c
  • Katadyn LandBased 1800 (Katadyn LB 1800)
  • Katadyn LandBased 4000 (Katadyn LB 4000)
  • FL-1800c-110-12, FL-1800c-110-24, FL-1800c-220-12, FL-1800c-220-24, FL-1800c-24
  • FL-2800c-220-12, FL-2800c-220-24
  • LB-1800M, LB 1800 M, LB 1800 F, LB-1800F
  • LB 4000 M, LB-4000M, LB 4000 F, LB-4000F

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: 15688111335

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Thomas J Standeven
Massapequa, US
★★★★★ 5
Very fuctional
Color: 01-silver
Very stylish and functional, the suction cups hold it in place
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Reviewed in the United States on May 25, 2026
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Jacki Torres
Cuba, US
★★★★★ 4
Functional and Good Quality
Color: 01-silver, Color: 01-silver
I give this SMARTAKE paper towel holder 4 stars. Overall, it's a very good product that I would recommend, but it has one minor drawback that takes away a star. The Positives Quality and Stability: The holder feels good quality, and the material (steel) is sturdy. Once placed on the counter, it's stable and adheres well to the surface. Assembly and Use: It was easy to put together; just read the instruction manual. I confirm that it works well even with large paper towel rolls. Furthermore, it's not difficult to change the roll at all. The Drawback The only problem is the small mechanism that's supposed to adjust and hold the roll (the piece that prevents it from twisting too much). As the paper gets used up, this piece doesn't do its job properly, and the paper unwinds more than it should. Conclusion: If you're looking for a modern, stable, and well-made holder for your kitchen, this is excellent. Just keep in mind that the adjuster isn't the best, but other than that, it does its job perfectly.
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Reviewed in the United States on October 18, 2025
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Patty C
Draper, US
★★★★★ 5
Durable and nice look
Color: 02-black
Nice quality and nice look for our kitchen
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Reviewed in the United States on May 30, 2026
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K. K.
Draper, US
★★★★★ 5
Classic holder keeps paper towels in place in a breeze.
Color: 06-bronze
This classic paper towel holder works perfectly. I had constantly unrolling paper towels in the breeze. This holder keeps everything in place now. So nice. Plus, it has a sleek, uncluttered design. I’m very pleased.
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Reviewed in the United States on May 18, 2026
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Terry Anne
Alexandria, US
★★★★★ 3
Only holds towels in place when it is full or 1/2 full
Color: 01-silver
If you are buying this for the feature of holding the paper towels in place so you can just rip one, I think you will be disappointed. Once the roll becomes smaller (and I tried changing the arm) the arm does not touch the towels. I do like the firm grip on the counter. My other dissatisfaction is the base gets water spots. Being near the sink this happens frequently. It does its job and is attractive.
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Reviewed in the United States on May 21, 2026

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