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Dow Filmtec BW30LE-440 Reverse Osmosis (RO) Membrane

11,500 GPD industrial / commercial low energy replacement reverse osmosis (RO) membrane element

THIS PRODUCT HAS BEEN DISCONTINUED and is no longer available.

The Filmtec BW30LE-440 element has a nominal active membrane area of 440 square feet (41 m2) and an average permeate flow of 11,500 gpd (44 m3/d) at 150 psi under standard conditions as noted below. External element dimensions are identical to those of conventional 8 inch elements; however, the inside diameter of the product water tube is slightly larger (see dimension B below). Optimizing membrane chemistry results in lower pressure operation than the Filmtec BW30-400, which means system operating economy is enhanced. Because the high productivity of the Filmtec BW30LE-440 element results from increased surface area and increased element efficiency, the rate of membrane fouling remains low. This means higher flow rates can be sustained over time and element service life is prolonged. The productivity advantages of the Filmtec BW30LE-440 element can be employed in the design of new systems that produce the desired flow rate while operating at significantly lower feed pressures which can result in savings due to lower energy consumption and fewer pumps. The high surface area of the Filmtec BW30LE-440 element permits designs of new RO systems that meet productivity targets with fewer elements than standard 8-inch elements resulting in lower installed system cost by reducing the number of system components and lower installation expense.

Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:600 psi (41 bar)
Maximum Pressure Drop:15 psi (1.0 bar)
Maximum Feed Flow Rate:85 gpm (19 m3/hr)
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:11,500 GPD (44 m3/day)*
Stabilized Salt Rejection:99.0%
Filmtec BW30LE-440 Reverse Osmosis (RO) Membrane

*Permeate flow and salt rejection based on the following standard conditions: 2,000 ppm NaCl, 150 psi (1.0 MPa), 77F (25C), pH 8 and 15% recovery. Flow rates for individual elements may vary but will be no more than 15% below the value shown.

**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).


   A: 40.0" (1,016mm)
   B: 1.5" (38mm)
   C: 7.9" (201mm)
Filmtec BW30LE-440 Size Chart
Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec BW30LE-440
Our Stock #703110610
Dow Part #not available
8.0 40 440 (41) 150 psi 11,500 (44) Discontinued

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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