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Dow Filmtec SW30-380 Reverse Osmosis (RO) Membrane

replacement 9,000 GPD seawater desalination reverse osmosis (RO) membrane element

The Filmtec SW30-380 is a high productivity seawater reverse osmosis element that offers the lowest energy consumption in the industry for optimal economics in two-pass seawater desalination systems. In addition, this element is well suited for high salinity brackish water applications.

  • The high flow and high rejection of membrane used in the SW30-380 helps reduce energy costs in the first pass of two-pass seawater systems.
  • Filmtec SW30-380 offers superior economics for desalinating cold water feeds (< 20C).
  • Filmtec SW30-380 elements deliver high performance without the use of oxidative treatments which is one reason why
  • Filmtec elements are more durable and may be cleaned more effectively over a wider pH range (1 - 13) than other RO elements.
Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:1,000 psi (69 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:9,000 GPD (34 m3/day)*
Stabilized Salt Rejection:99.4%
Minimum Salt Rejection:98.8%
Filmtec SW30-380 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 +/-15%.

**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: 1.125" (29mm)
   C: 7.9" (201mm)
Filmtec SW30-380 Size Chart

Element fits nominal 8-inch (203 mm) I.D. pressure vessels.

Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec SW30-380
Our Stock #703113853
Dow Part #113853
8 40 380 (35) 800 psi 9,000 (34)

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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