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Dow Filmtec RO-390-FF 40 inch × 8 inch Sanitary/Full Fit Medical Food Membrane

Dow Filmtec RO-390-FF 40 inch × 8 inch Sanitary/Full Fit Medical Food Membrane

Item SKU: RO-390-FF

MFG ID: RO-390-FF | UPC:

Dow Filmtec RO-390-FF 40 inch × 8 inch Sanitary/Full Fit Medical Food Membrane

The DOW RO-390-FF product is a premier membrane for evaporator condensate polishing. RO-390-FF has more active area than competitive elements to maximize performance and reduce capital cost by requiring the fewest elements for polishing applications. All materials of construction are compliant with U.S. Food & Drug Administration indirect food contact requirements and are suitable for use in food processing applications in the U.S.


  • Part number: 116314 / 100608
  • Nominal Active Surface Area: 390 (36) ft2 (m2)
  • Maximum Operating Pressure: 600 psi (41 bar)
  • Permeate Flow Rate: 10,800 (40.9) gpd (m3/d)
  • Stabilized Salt Rejection: 99.5 %
  • Membrane Type: Thin-Film Composite (Filmtech)
  • Maximum Operating Temperature: 113°F (45°C)
  • Maximum Feed Flow Rate: 6 (1.4) gpm (m3/h)
  • Maximum pressure drop: 15 psig (1.0 bar)
  • pH Range, Continuous Operation: 3-10
  • pH Range, Short Term Cleaning: 1-12
  • Maximum Feed Silt Density Index: SDI 5

RO-4040-FF was previously named BW30-4040-LW.
RO-390-FF replaces BW30-380-LW and BW30-8040-LW.
Permeate flow and salt rejection based on standard conditions: 2,000 ppm NaCl, 225 psi (16 bar), 77°F (25°C), pH 8 and 15% recovery.
Minimum stabilized salt rejection is 98.0%


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.

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.

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 drop across an entire pressure vessel (housing) is 50 psi (3.4 bar). Avoid static permeate-side backpressure at all times.

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