Dow Water & Process Solutions offers various premium seawater reverse osmosis (RO) elements designed to produce high quality water which may reduce capital and operation costs of desalination systems. DOW FILMTEC™ Elements combine excellent membrane quality with automated precision fabrication to take system performance to exceptional levels.
DOW FILMTEC™ SW30XHR–440i Element are the highest rejection seawater RO elements in the DOW FILMTEC element portfolio, enabling stringent water quality requirements to be met reliably with single-pass seawater systems in most situations. In addition, the combination of highest active area and a thick feed spacer results in higher productivity and lower cleaning frequency which enable sustainable lower lifecycle cost.
Benefits of the DOW FILMTEC SW30XHR–440i element include:
• Highest NaCl and boron rejection to help meet World Health Organization (WHO) and other drinking water standards more cost effectively.
• 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 a thick feed spacer (28 mil) allows low cleaning frequency and high cleaning efficiency.
• Utilization of the distinct iLEC™ Interlocking Endcaps helps 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 the 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.
• Effective use in permeate staged seawater desalination systems without impairing the performance of the downstream stage.
Spiral-wound element with polyamide thin-film composite membrane
40 in x 7.9 in
- The above benchmark values are based on the following test conditions: 32,000 ppm NaCl, 800 psi (5.5 MPa), 77°F (25°C), pH 8 and 8% recovery.
- Permeate flows for individual elements may vary ± 20%.
- Minimum Salt Rejection is 99.7%.
- 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 & 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)||13 psig (0.9 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.