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Dow Filmtec SW30HRLE-4040 Reverse Osmosis (RO) Membrane

replacement 1,600 GPD seawater desalination reverse osmosis (RO) membrane element

Filmtec SW30HR LE-4040 reverse osmosis element is a four-inch diameter version of SW30HR LE-400, the industry's leading seawater element which offers an unprecedented combination of high salt rejection and productivity to enable the lowest total cost of purifying high salinity water.

  • SW30HR LE-4040 may be used as a pilot element to demonstrate performance for the design of larger systems.
  • SW30HR LE-4040 delivers the highest sodium chloride and boron rejection to help meet World Health Organization (WHO) and other drinking water standards.
  • SW30HR LE-4040 elements deliver high performance over the operating lifetime without the use of oxidative post-treatments like many competitive products. This is one reason Filmtec elements are more durable and may be cleaned more effectively over a wider pH range (1-13) than other RO elements.
Membrane Type:Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:1,200 psi (83 bar)
Maximum Pressure Drop:15 psi (1.0 bar)
pH Range, Continuous Operation:2-11***
pH Range, Short-Term Cleaning:1-13* (30min)
Maximum Feed Silt Density Index:5 SDI
Free Chlorine Tolerance:<0.1 ppm**
Permeate Flow Rate:1,600 GPD (6.1 m3/day)*
Stabilized Salt Rejection:99.75%
Minimum Salt Rejection:99.6%
Filmtec SW30HRLE-4040 Reverse Osmosis (RO) Membrane

*The above benchmark values are based on the following test conditions: 32,000 ppm NaCl, 800 psi (5.5 MPa), 77F (25C), pH 8 and 8% recovery. Permeate flows for individual elements may vary +/-20%.

**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. Most RO systems have carbon pre-filters for this purpose.

***Maximum temperature for continuous operation above pH 10 is 95F (35C).

Note: Active surface area guaranteed +/-5%. Active area as stated by FilmTec is not comparable to nominal membrane area often stated by some manufacturers.


   A: 40.0" (1,016mm)
   B: 1.05" (26.7mm)
   C: 0.75" (19mm)
   D: 3.9" (99mm)
Filmtec SW30HRLE-4040 Size Chart

Element fits nominal 4-inch I.D. pressure vessel.

Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec SW30HRLE-4040
Our Stock #703255048
Dow Part #255048
4 40 85 (7.9) 800 psi 1,600 (6.1)
MSRP: US$876.88
Price: US$491.00
You save: $385.88

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Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.

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