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.
Polyamide Thin-Film Composite
40 in x 7.9 in
- The above values are normalized to the following conditions: 32,000 ppm NaCl, 5 ppm boron, 800 psi (5.5 MPa), 77°F (25°C), pH 8, 8% recovery.
- Permeate flows for individual elements may vary ± 15%.
- Minimum Salt Rejection is 99.6%.
- Stabilized salt rejection is generally achieved within 24 – 48 hours of continuous use; depending upon feedwater characteristics and operating conditions.
- Product specifications may vary slightly as improvements are implemented.
- Active area guaranteed ± 5%. Active area as stated by Dow Water and Process Solutions is not comparable to the nominal membrane area figure often stated by some element suppliers. Measurement method described in Form No. 609-00434.
Operating and Cleaning Limits
Short-Term Cleaning (30 min.)
|113°F (45°C)||1,200 psig (83 bar)||15 psig (1.0 bar)||2 – 11||1 – 13||SDI 5||< 0.1 ppm|
• Maximum temperature for continuous operation above pH 10 is 95°F (35°C).
• Refer to guidelines in “Cleaning Procedures” for more information
• 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 Water & Process Solutions recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin “Dechlorinating Feedwater”for more information.