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Dow Filmtec XLE-4021 Reverse Osmosis (RO) Membrane

1,025 GPD low pressure light industrial / commercial / whole house replacement reverse osmosis (RO) membrane element

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:1,025 GPD (3.9 m3/day)*
Stabilized Salt Rejection:99.0%

*Permeate flow and salt rejection based on the following test conditions: 500 ppm NaCl feedstream, applied pressure of 100 psi (6.9 bar), 77F (25C) and the following recovery rates: XLE-2521, XLE-4021 - 8%; XLE-2540, XLE-4040 - 15%. Permeate flow rates 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).

Filmtec XLE-4021 Reverse Osmosis (RO) Membrane


   A: 21.0" (533mm)
   B: 1.05" (26.7mm)
   C: 0.75" (19mm)
   D: 3.9" (99mm)
Filmtec XLE-4021 Size Chart
Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec XLE-4021
Our Stock #7030402101
Dow Part #154540
4.0 21 36 (3.3) 100 psi 1,025 (3.9)
MSRP: US$708.00
Price: US$396.00
You save: $312.00

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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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