DOW FILMTEC BW30FR-400/34i Membrane

Product Description

The DOW FILMTEC BW30FR-400/34i element is the ultimate element for durable, high rejection, high productivity performance to purify water with high biological or organic fouling tendency. The wide, 34 mil feed spacer lessens the impact of fouling and enhances cleaning effectiveness and Dow's proprietary FR membrane technology provides superior fouling resistance and cleanability. High rejection DOW FILMTEC RO membrane that has the widest pH cleaning range in the industry (pH 1-13) that allows for effective cleaning of scale, organic compounds and biofilm. It also employs the iLEC™ interlocking endcaps, which reduce system operating costs and the risk of o-ring leaks that compromise system integrity and cause poor water quality. This unique combination of features offers system operators the best long-term economics and most trouble-free operation for RO membrane purification of fouling waters.


  • Fouling resistant reducing cleaning requirements and operational cost;
  • durable with good cleanability for long element life;
  • Filmtec Performance and quality

Important Information

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.

Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.

Please refer to the application information literature entitled “Start-Up Sequence” (Form No. 609-02077) for more information.

Operation Guidelines

Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:

  • Feed pressure should be increased gradually over a 30-60 second time frame.
  • Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
  • Permeate obtained from first hour of operation should be discarded.

General Information

  • Keep elements moist at all times after initial wetting.
  • If operating limits and guidelines given in this bulletin are not strictly followed, the DOW™ FILMTEC™ Reverse Osmosis and Nanofiltration Three-Year Prorated Limited Warranty (Form No. 609-35010) will be null and void.
  • To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
  • The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
  • Maximum pressure drops are 15 psi (1.0 bar) per element or 50 psi (3.4 bar) per multi element pressure vessel (housing) which ever value is more limiting.
  • Avoid static permeate-side backpressure at all times.
Product Part number Active area ft2 (m2) Feed spacer thickness (mil) Permeate flow rate gpd (m3/d) Stabilized salt rejection (%) Minimum salt rejection (%)
BW30FR-400/34i 273805 400 (37) 34 10,500 (40) 99.5 99

The DOW FILMTEC™ BW30FR-400/34i has optimized construction for durable, high rejection, high productivity performance in purifying water with high biological fouling tendency. With Dow’s proprietary fouling resistant membrane technology that offers exceptional fouling resistance and cleanability, this product combines the best features of the DOW FILMTEC BW30FR-365 and BW30FR-400 elements.

Operating Limits
  • Membrane Type Polyamide Thin-Film Composite
  • Maximum Operating Temperature 113°F (45°C)
  • Maximum Operating Pressure 600 psig (41 bar)
  • Maximum Pressure Drop 15 psig (1.0 bar)
  • pH Range, Continuous Operation 2 - 11
  • pH Range, Short-Term Cleaning (30 min.) 1 - 13
  • Maximum Feed Silt Density Index SDI 5
  • Free Chlorine Tolerance <0.1 ppm
  • Industrial water demineralization
  • Production of municipal drinking water
  • Water reuse
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  • 5
    They know their products

    Posted by Alfredo Ê. on Apr 14th 2020

    These guys are awesome...they helped us to get a replacement for a discontinued products.

  • 5
    Always in stock!

    Posted by Majid G. on Nov 7th 2019

    We never had to wait...always in stock.

  • 5
    Top seller

    Posted by Ion M. on Nov 21st 2018

    They compete in price

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