DOW FILMTEC HRLE-440i Membrane

Product Description

Featuring breakthrough membrane chemistry, the DOW FILMTEC HRLE-440i element delivers the same 99.5% nominal NaCl rejection as traditional brackish water elements but at 33% lower pressures.


  • High rejection results in excellent water quality
  • Reduced downstream polishing required
  • High flux reduces energy use
  • Durable with good cleanability for long element life
  • Filmtec Performance and quality

General 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.

Important 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) whichever 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 (%)
HRLE-440i 347733 440 (41) 28 12,650 (48) 99.3 99.5
Typical Stabilized Rejections for Individual Solutes
Silica rejection (%) Boron rejection (%) Nitrate rejection (%) Ammonium rejection (%) Isopropyl alcohol rejection (%)
99.8 68 97 97.5 94
  • Lower energy requirements allow new reverse osmosis systems to be designed to use one third less energy and still deliver the same permeate quality compared with other BW elements
  • Existing low energy systems can be retrofitted to achieve lower permeate TDS than possible with previous low energy elements
  • The combination of low energy and high rejection is ideally suited for use in the second pass of seawater and high-purity applications
  • Excellent rejection of silica, boron, nitrate and ammonium; supported by Dow’s modeling software
  • Increased IPA rejection (IPA rejection is a common surrogate for TOC removal)
  • Available dry for longer storage life and easier handling
Operating Limits
  • Membrane Type Advanced 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 Flow 85 gpm (19 m3/h)
  • 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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(3 reviews) Write a Review
  • 5
    The best membrane supplier

    Posted by Pillaz M. on Apr 14th 2020

    shipped same delivery, thanks

  • 5
    High stock value

    Posted by Elmer C. on Nov 7th 2019

    We ordered large quantity and you were able to satisfy our need on time. Thanks!

  • 5
    Great solution for water treatment

    Posted by Pacífico P. on Nov 21st 2018

    Better prices here!

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