DOW FILMTEC SW30HRLE-370/34i Membrane

Product Description

DOW FILMTEC™ SW30HRLE-370/34i element is a durable, high-rejection, high-productivity seawater element for use in high fouling or challenging feedwater conditions, helping to support smooth operations and low cost of water.


  • High flux reduces energy use or pressure required
  • Good rejection results in good quality water
  • High boron rejection
  • 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 limited warranty will be null and void. Refer to DOW™ FILMTEC™ Reverse Osmosis and Nanofiltration Element Three-Year Prorated Limited Warranty (Form No. 609-35010)
  • 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 drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).
  • Avoid static permeate-side backpressure at all times.
Product Part Number Active Area Maximum Operating Pressure Permeate Flow Rate Stabilized Boron Rejection % Minimum Salt Rejection % Stabilized Salt Rejection %
ft2 (m2) psig (bar) GPD (m3/d)
SW30HRLE-370/34i 297 370 (34.4) 1,200 (83) 6,700 (25) 99.65 99.8 99.7

Dow Water & Process Solutions offers various premium seawater reverse osmosis (RO) elements designed to produce high quality water and reduce capital and operation cost of seawater RO systems. These products combine premium membrane performance with automated precision fabrication to provide reliable and consistent performance.
DOW FILMTEC™ SW30HRLE-370/34i element is a durable, high-rejection, high-productivity seawater element for use in high fouling or challenging feedwater conditions, helping to support smooth operations and low cost of water.

The benefits of DOW FILMTEC™ SW30HRLE-370/34i elements include:
  • A wide 34 mil feed spacer to lessen the impact of fouling on pressure drop across a vessel and enhance cleaning effectiveness.
  • An active area of 370 square feet maximizing productivity and enabling accurate and predictable system design and operating flux.
  • Utilization of the distinct iLEC™ interlocking endcaps that help to reduce system operating costs and reduce the risk of o-ring leaks that cause poor water quality.
  • Effective use in permeate staged seawater desalination systems without impairing the performance of the downstream stage.
  • High performance over the operating lifetime without the use of oxidative post-treatments. DOW FILMTEC elements are more durable and may be cleaned over a wider pH range (1-13).
  • Automated, precision fabrication with a greater number of shorter membrane leaves reducing the effect of overall fouling and maximizing element efficiency.
Operating Limits
  • Membrane Type Polyamide Thin-Film Composite
  • Maximum Operating Temperature 113°F (45°C)
  • Maximum Element Pressure Drop 13 psig (0.9 bar)
  • pH Range, Continuous Operation 2 – 11
  • pH Range, Short-Term Cleaning (30 min.) 1 – 13
  • Maximum Feed Silt Density Index (SDI) SDI 5
  • Free Chlorine Tolerance <0.1 ppm
  • Seawater desalination
  • Municipal drinking water
  • Industrial desalination
[custom-documents] [/custom-documents]
(2 reviews) Write a Review
  • 5
    No quality problem ever

    Posted by Vanilde D. on Nov 16th 2019

    We received the item very fast. Thanks!

  • 5
    Good supplier

    Posted by Neusandra S. on Aug 3rd 2018

    An immensely optimum seller

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