4"x40" | 1,950 GPD | 99.4% Salt Rejection | Watermaker | FilmTec SW30-4040 Seawater Membrane

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Brand DOW Filmtec
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Recommended Compatible Alternative: AMI Membranes are Made-In-USA with a large inventory in stock for immediate shipment & are competitively priced. AMI M-S4040A may be used as a direct replacement for SW30-4040 seawater RO membrane.

DOW FilmTec Membrane Elements

DuPont FILMTEC SW30-4040 Seawater RO Elements for Watermakers and Marine Systems (Replaces SW30HRLE-4040)

DuPont DOW FILMTEC SW30-4040 elements have one of the highest flow rates available to meet the water demands of both sea-based and land-based desalinators. Commonly used in on-board Watermakers to create drinking water from seawater for yachts, boats, and cruise ships, DOW FILMTEC marine SWRO elements offer the highest productivity while maintaining excellent salt rejection.  DOW FILMTEC SW30 elements may also be operated at lower pressure to reduce pump size, cost, and operating expenses

DuPont (formerly DOW) FILMTEC SW30-4040 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

Product Specifications

FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   

DOW FilmTec vs DuPont FilmTec & Membrane Compatibility Notes:

  • DowDuPont merger was completed in 2017 and FilmTec Corporation was moved to DuPont. DOW Water Solutions and DOW FilmTec Membranes are now DuPont Water Solutions and DuPont FilmTec Membranes.

  • FilmTecMembrane SW30HRLE-4040 (255048) was discontinued by DuPont in 2022. The factory-recommended replacement is SW30-4040.

Specifications for SW30-4040

FilmTec Product: SW30-4040
FilmTec Part Number: 80741
Replaces Membrane: SW30HRLE-4040
Size (Approximate): 4" Dia. x 40"L
Flow Rate: 1,900 gpd (7.4 m³/d)
Applied Pressure: 800 psig (55 bar)
Stabilized Salt Rejection: 99.4%
Exterior: Hard Shell Fiberglass
Membrane Type:
Polyamide Thin-Film

Permeate flow and salt rejection based:  32,000 ppm NaCl feed stream, 77°F, 8% recovery, 800 psig.

Operating Limits for SW30-4040

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***: <0.1ppm

*Maximum temperature for continuous operation above pH 10 is 95°F
**Refer to cleaning guidelines.
***Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow recommends removing residual free chlorine by pretreatment prior to membrane exposure.

Benefits of DuPont FilmTec Marine RO Membranes:

  • Convert seawater into drinking water on yachts, boats, cruise ships, off-shore platforms, and resorts
  • High flux reduces energy use or pressure required
  • Good rejection results in good quality water
  • FilmTec performance and quality

Common Applications for FilmTec SW30-4040 Seawater RO Elements:

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

Physical Dimensions of DuPont DOW FilmTec SW30-4040 SWRO

Dimensions of FilmTec Membrane Element  
A 40.0 (1,016)
B 1.05 (2637)
C 0.75 (19)
D 3.9 (99)

SW30-4040 Fits nominal 4-Inch ID pressure vessels and has identical dimensions to SW30HRLE-4040 which is now discontinued.