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.

Operating Limits:

• 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 Operationa…………………………….2 - 11
• pH Range, Short-Term Cleaning (30 min.)b………...............1 - 13
• Maximum Feed Silt Density Index……………………………..SDI 5
• Free Chlorine Tolerancec………………………………….....<0.1 ppm
  

a Maximum temperature for continuous operation above pH 10 is 95˚F (35˚C).

b Refer to Cleaning Guidelines in specification sheet 609-23010.

c Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, DOW FILMTEC recommends removing residual free chlorine by pretreatment prior to membrane exposure.