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DOW FILMTEC Nanofiltration 2.5" Membrane Elements

FilmTec elements from Dow 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 Dow 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 DOW 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 DOW 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 micropolluants.

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


Dow 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

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