4"x40" | 1,950 GPD | High Rejection | FilmTec Seawater Membrane

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Brand DOW Filmtec
Model SW30HRLE-4040

DOW FilmTec Membrane Elements

DOW FILMTEC™ SW30HR LE-4040 Seawater RO Elements for Watermakers and Marine Systems

DOW FILMTEC SW30HRLE-4040 Elements are the 4-inch diameter version of DOW FILMTEC SW30HRLE-400, one of the industry's leading seawater elements, which offers an unprecedented combination of high salt rejection and productivity to enable the low total cost of purifying high salinity water. DOW FILMTEC SW30HRLE-4040 elements deliver high performance over the operating lifetime without the use of oxidative post-treatements and high sodium chloride and boron rejection to help meet World Health Organization (WHO) and other drinking water standards. DOW FILMTEC SW30HRLE-4040 may be used as a pilot element to demonstrate performance for the design of larger systems.

DOW FILMTEC SW30HR LE-4040 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

Product Specifications


FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   



Specifications for SW30HR LE-4040

FilmTec Product: SW30HR LE-4040
FilmTec Part Number: 255048
Size (Approximate): 4" Dia. x 40"L
Flow Rate: 1,600 gpd (6.1 m³/d)
Applied Pressure: 800 psig (55 bar)
Stabilized Salt Rejection: 99.75%
Minimum Salt Rejection: 99.60%
Exterior: Hard Shell Fiberglass
Active Membrane Surface Area: 85 sq. ft.
Feed Spacer: 28 mil
Membrane Type:
Polyamide Thin-Film

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

Operating Limits for SW30HR LE-4040

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 1,000 psig (69 bar)
Maximum Pressure Drop: 15 psig (1 bar)
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.

Related Products for use with SW30HR LE-4040 Seawater Elements

CodeLine 4x40 Fiberglass Pressure Vessel 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
Membrane Preservative Cartridge for Preserving the System and Membrane During Extended Periods of Non-Operation.
655139-03 Oil Adsorbing 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

Benefits of DOW 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
  • High salt rejection results in good quality water
  • High boron rejection
  • FilmTec performance and quality

Common Applications for FilmTec SW30HR LE-4040 Seawater RO Elements:

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

Physical Dimensions of DOW FilmTec SW30HR LE-4040 SWRO

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

SW30HR LE-4040 Fits nominal 4-Inch ID pressure vessels.

For more information, please visit this products webpage.