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 which takes system performance to unprecedented levels.

DOW FILMTEC™ SW30XLE-440i offers medium salinity and medium temperature feed waters an advanced combination of high productivity and high rejection through extra-low energy consumption and single-pass design. It is also an ideal choice for two-pass seawater designs or high salinity brackish water applications. The combination of highest active area and thickest feed spacer of the DOW FILMTEC membranes results in higher productivity and lower cleaning frequency which enable sustainable lower lifecycle cost. Benefits of SW30XLE-440i include:

• Active area of 440 sq. ft., enables systems to be designed to deliver the lowest total cost of water by optimizing energy consumption, system productivity and operating flux.
• The highest guaranteed active area of 440 ft2 (41 m2) permits lowest system capital 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 help reduce system operating costs and reduce 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, 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.
• Can effectively be used 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.