DOW FILMTEC ECO-440i Membrane

Product Description

DOW FILMTEC ECO elements offer unparalleled rejection and flow performance for your industrial water needs, enabling lower energy usage and reduced regeneration costs in downstream polishing units. With a new industry-leading performance of 99.7 percent rejection at 150 psi, DOW ECO elements provide robust performance over a longer element life. At highest quality, the elements deliver 40 percent lower salt passage at 30 percent less energy, when compared to standard RO elements - an ecological and economic win.


  • Highest rejection for the highest quality permeate, 40% better compared to industry standard membranes
  • 30% lower energy than typical high rejection brackish water elements
  • Specially designed low dP 28 mil feed spacer for lower feedside pressure drop along with the iLEC interconnecting end cap for better productivity and reliability

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 limited warranty 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) Typical Stabilized salt rejection (%) Minimum salt rejection (%)
ECO-400i 11026673 400 (37) 34-LDP 11,500 (44) 99.7 99.5
ECO-440i 11026679 440 (41.2) 28-LDP 12,650 (48) 99.7 99.5
ECO-500i 11031767 500 (46.5) 23-LDP 14,375 (54) 99.7 99.5
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
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(1 review) Write a Review
  • 5
    Best supplier

    Posted by Pacífico P. on May 3rd 2019

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

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