HomeMaisam ShopFilter MembraneDOW FILMTEC SW30HRLE-440i Membrane


The DOW FILMTEC SW30HRLE-440i element offers sustainable lower lifecycle cost for medium and high salinity feedwaters by combining high rejection and low energy performance with the high active area and thick feed spacer of the Dow membranes.


  • 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 pecifications so that system water quality and productivity goals can be achieved.

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

Please refer to the application information literature entitled “Start-Up Sequence” (Form No. 609-2077) 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.
  • Please refer to the product technical manual.

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.

Buy KRYTOX-GPL-206 (2-OZ-TUBE) in Dubai, Sharjah, Ajman, Umm al Quwain, Al Ain, Ras al Khaimah, Abu Dhabi, UAE  at best Prices from Maisam Trading LLC. Ready Stock Available.

Check out our range of KRYTOX In Dubai, Sharjah, Ajman, Umm al Quwain, Al Ain, Ras al Khaimah, Abu Dhabi ,Saudi Arabia, Qatar, Oman, Bahrain by clicking here


Product 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-440i 440 (41) 1,200 (83) 8,200 (31) 92 99.65 99.8


Dow Water & Process Solutions offers various premium seawater reverse osmosis (RO) elements designed to reduce capital and operation cost of desalination systems. DOW™ FILMTEC™ products combine excellent membrane quality with automated precision fabrication, taking system performance to unprecedented levels.

The DOW™ FILMTEC™ SW30HRLE-440i element offers sustainable lower lifecycle cost for medium and high salinity feedwaters by combining high rejection and low energy performance with the highest active area and thickest feed spacer of the Dow membranes. Benefits of the DOW FILMTEC™ SW30HR LE-440i element include:

  • Enables systems to be designed and operated to either lower operating cost through reduced energy consumption, or to decrease capital cost through higher productivity at lower operating fluxes.
  • High NaCl and boron rejection to help meet World Health Organization (WHO) and other drinking water standards.
  • The highest guaranteed active area of 440 ft2 (41 m2) permits lowest system cost by maximizing productivity and enables accurate and predictable system design and operating flux.
  • The combination of highest active area with thickest feed spacer (28 mil) allows low cleaning frequency and high cleaning efficiency.
  • Utilization of the distinct iLEC™ interlocking endcaps that help reduce system operating costs and the risk of o-ring leaks that can cause poor water quality (See Form No. 609-00446 for information on cost-saving benefits).
  • Sustainable high performance over the operating lifetime of the element, because oxidative treatments are not used in membrane production. This is one reason DOW FILMTEC elements are more durable and may be cleaned more effectively over a wider pH range (1-13) than most other RO elements, which use oxidative treatments.
  • Effective use in permeate staged seawater desalination systems without impairing the performance of the downstream stage.
  • Membrane Type Polyamide Thin-Film Composite
  • Maximum Operating Temperaturea 113°F (45°C)
  • Maximum Element 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) SDI 5
  • Free Chlorine Tolerance <0.1 ppm


  • Seawater desalination
  • Municipal drinking water
  • Industrial desalination


DOW FILMTEC SW30HRLE-440i Membrane