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Dow Filmtec NF90-4040 Nanofiltration Membrane

2,000 GPD replacement nanofiltration membrane element

The Filmtec NF90 membrane elements provide high productivity performance while removing a high percentage of salts, nitrate, iron and organic compounds such as pesticides, herbicides and THM precursors. The low net driving pressure of the NF90 membrane allows the removal of these compounds at low operating pressures.

Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:600 psi (41 bar)
Maximum Feed Flow Rate:16.0 gpm (3.6 m3/hr)
pH Range, Continuous Operation:2-11***
pH Range, Short-Term Cleaning:1-12* (30min)
Maximum Feed Silt Density Index:5 SDI
Free Chlorine Tolerance:<0.1 ppm**
Permeate Flow Rate:2,000 GPD (7.6 m3/day)*
Stabilized Salt Rejection:>97.0%

*Permeate flow and salt rejection based on the following test conditions: 2000 ppm MgSO4, 77F (25C) and 15% recovery at 70 psi (4.8 bar). Permeate flow rates for individual elements may vary -20% / +50%.

**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 NF90-4040 Nanofiltration Membrane


   A: 40.0" (1,016mm)
   B: 1.05" (27mm)
   C: 0.75" (19mm)
   D: 3.9" (99mm)
Filmtec NF90-4040 Size Chart
Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec NF90-4040
Our Stock #703149983
Dow Part #149983
4 40 70 (4.8) 82 (7.6) 2,000 (7.6)
MSRP: US$781.75
Price: US$438.00
You save: $343.75

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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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