DOW FILMTEC Nanofiltration 2.5" Membrane Elements

DUPONT FILMTEC Nanofiltration 2.5" Membrane Elements

Nanofiltration membrane elements are perfectly suited for applications dealing with elevated levels of THM and TOC precursors with various degrees of salt and medium passages. Ground water and surface water that requires the removal of organic substances are especially ideal applications to treat with these membranes. 

These elements deliver great productivity capacity while simultaneously eradicating large amounts of salinity, iron, nitrates, and organic material that include herbicides and pesticides. The decreased pressure of nanofiltration membranes permit the elimination of substances at reduced operating pressures.

DUPONT FILMTEC NF270-2540 Membrane
  • Max. Flow Rate: 6 GPM
  • Max. Pressure: 600 PSI
  • Pressure Drop: 15 psig
  • Max. Temperature: 113°F
DUPONT FILMTEC NF90-2540 Membrane
  • Max. Flow Rate: 6 GPM
  • Max. Pressure: 600 PSI
  • Pressure Drop: 15 psig
  • Max. Temperature: 113°F

Pure Aqua has over 20 years of experience as a global provider of 2.5" Dupont/Dow Filmtec Nanofiltration Membrane Elements for effective elimination of organic substances, low consumption of energy, reduced costs, consistent long-term use with simple maintenance.

FilmTec elements from Dupont feature a spiral wound design and are based on the FT30 thin-film composite polyamide membrane, which has long been the industry standard for RO performance. The Dupont FilmTec Nanofiltration membrane consists of three layers: an ultra-thin polyamide barrier layer, a microporous polysulfone interlayer, and a high-strength polyester support web. The NF membrane has been continuously updated and refined to provide higher rejection, improved membrane flux, and low fouling performance. Today's nanofiltration membrane elements are uniquely uniform in performance and quality, without the taped or glued defects that can cause other membranes to fail. Good understanding and execution of the basics of reverse osmosis can minimize troublesome and costly problems in the future.

Thin-Film Composite (TFC Membrane) design

The DUPONT FILMTEC nanofiltration membrane elements are ideal for removing a high percentage of TOC and THM precursors with medium to high salt passage and medium hardness passage. The DUPONT FILMTEC nanofiltration membrane is an ideal choice for surface water and groundwater where good organic removal is desired with partial softening.

Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved.

Filmtec nanofiltration membranes are constructed to cautiously eliminate sulfate from saltwater for the purposes of offshore oil production, and other applications. This nanofiltration membrane remains efficient during operation at low pressures, and is capable of eradicating particles greater than .001 microns. This results in ultrapure water that is clear of all bacteria, silica and other micropollutants.

Filmtec nanofiltration membranes make for an easy separation of organics and salt for industrial and municipal water purification systems that turn out greater than 12 gallons per minute of permeate. These membranes are perfect for water treatment operations that require ultrapure permeate water that is free of certain contaminants such as iron, nitrates, salts, and organic substances.

Used In:

  • Production of fresh and potable water
  • Water Deionization in commercial applications
  • Water Reuse


  • Efficient removal of organic substances
  • Water softening preserves water quality
  • Good yields due to high flux
  • Less consumption of power & energy which reduces cost
  • Very reliable and durable with easy cleanability
Dupont FilmTec Membranes
Tapwater Commercial RO  2.5"x40” and 4"x40” membranes, TW30, XLE, LP, BW30, TW30HP
Tapwater Industrial RO  4”x40” and 8”x40” membranes, l BW30, BW30LE, LE, XLE, FR, RO, HSRO
Seawater RO Elements  2.5"x40”, 4”x40” and 8"x40” Seawater membranes, SW30, SW30HR, SW30HRLE
Nanofiltration Elements  4”x40” and 8"x40” Nanofiltration membranes, NF90, NF270, NF200, NF
Semiconductor Grade  8" Dia. Semiconductor SG, SG30