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Dow Filmtec XLE Pro-4040 Reverse Osmosis (RO) Membrane

2,750 GPD industrial / commercial low energy replacement reverse osmosis (RO) membrane element

Filmtec XLE elements offer better system performance and economics by operating at very low applied pressure. XLE membrane, made with a patented technology, provides consistent and reliable system performance. And for added convenience, XLE elements are available in a dry state for rapid start-up. The new XLE series of elements replaces TW30LE elements which were made with an older membrane technology.

XLE Pro-4040 elements replace the XLE-4040, offering equivalent performance and more advanced fouling resistant technology. They fit nominal 4-inch I.D. pressure vessels.

Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:600 psi (41 bar)
Maximum Pressure Drop:13 psi (0.9 bar)
Maximum Feed Flow Rate:14 gpm (3.2 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:2,7500 GPD (10.4 m3/day)*
Stabilized Salt Rejection:99.0%
Filmtec XLE Pro-4040 Reverse Osmosis (RO) Membrane

*Permeate flow and salt rejection based on the following test conditions: 500 ppm NaCl feedstream, pressure specified above, 77F (25C), and recovery rate of 15%. 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).


   A: 40.0" (1,016mm)
   B: 1.05" (26.7mm)
   C: 0.75" (19mm)
   D: 3.9" (99mm)
Filmtec XLE-4400 Size Chart
Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec XLE Pro-4040
Our Stock #7030404005
Dow Part #12082995
4.0 40 87 (8.1) 100 psi 2,750 (10.4)
MSRP: US$603.75
Price: US$338.00
You save: $265.75

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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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