The DOW 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.

Operating Limits:

• Membrane Type…………………………………………………Polyamide Thin-Film Composite
• Maximum Operating Temperaturea …………………………113˚F (45˚C)
• Maximum Operating Pressure…………………………………600 psig (41 bar)
• Maximum Feed Flow Rate………………………………….. 6 gpm (1.4 m3/hr)
• Maximum Pressure Drop- Tape wrapped…………………….13 psig (0.9 bar)
• Fiberglassed……………………..15 psig (1.0 bar)
• pH Range, Continuous Operationa…………………………….2 - 11
• pH Range, Short-Term Cleaning (30 min.)b………...............1 - 12
• Maximum Feed Silt Density Index……………………………..SDI 5
• Free Chlorine Tolerancec………………………………….....<0.1 ppm
  

a Maximum temperature for continuous operation above pH 10 is 95˚F (35˚C).

b Refer to Cleaning Guidelines in specification sheet 609-23010.

c 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 FILMTEC recommends removing residual free chlorine by pretreatment prior to membrane exposure.