Our FILMTEC™ low-energy seawater reverse osmosis membrane elements offer the industry’s most reliable seawater desalination production. Advanced membrane technology and automated fabrication allow these elements to deliver consistent high flow rates to meet the water demands of both sea and land-based desalinators. Designed to optimize operating and capital costs through lower energy consumption and higher productivity at lower operating fluxes. Very high NaCl and boron rejection helps meet World Health Organization (WHO) and other drinking water standards more cost effectively. Elements that utilize Filmtec’s iLEC interlocking endcaps help reduce system operating costs and reduce the risk of o-ring leaks that cause poor water quality. Low energy seawater membranes can withstand up to 1,200 psi operation without degradation in flow, salt rejection and physical appearance and their performance remains stable over many years, even under harsh operating conditions. |
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MEM-SW30HRLE-400
(7,500 GPD) |
Effective use in permeate staged seawater desalination systems without impairing the performance of the downstream stage. Enables systems to be designed & operated to optimize operating cost through lower energy consumption or to optimize capital cost through higher productivity at lower operating fluxes. |
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Operating Limits
Membrane Type |
Polyamide Thin-Film Composite |
Maximum Operating Temperature |
113 DegreeF (45 DegreeC) |
Maximum Pressure Drop |
13 psig (0.9 bar) for SW30HRLE-370/34i, SW30ULE400i, SW30ULE-440i.
15 psig (1.0 bar) for SW30HRLE-4040, SW30HRLE-400, SW30HRLE-400i, SW30HRLE-440i. |
pH Range, Continuous Operation |
2-11 |
pH Range, Short-Term Cleaning |
1-13 |
Maximum Feed Silt Density Index |
SDI 5 |
Free Chlorine Tolerance |
<0.1ppm |
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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 specifications so that system water quality and productivity goals can be achieved.
Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.
Please refer to the application information literature entitled “Start-Up Sequence” (Form No. 609-02077) for more information.
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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.
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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.
- 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 drops are 15 psi (1.0 bar) per element or 50 psi (3.4 bar) per multi-element pressure vessel (housing) whichever value is more limiting.
- Avoid static permeate-side backpressure at all times.
Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.
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About Filmtec
FILMTEC Corporation is the leading manufacture of reverse osmosis and nanofiltration membrane elements for industrial, municipal, commercial, and home drinking water treatment and purification, as well as for other specialty applications. The company was incorporated in 1977 and is headquartered in Minneapolis, Minnesota. FILMTEC Corporation is a subsidiary of The Dow Chemical Company and part of Dow's Water & Process Solutions business group.
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