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Permeate Production Calculator FILMTEC® 50, 75, and 100 gpd Reverse Osmosis Membranes Input Factory Specified Membrane Capacity Select 50, 75, or 100 gallons per day (gpd) 50 75 100 gpd* Water Pressure Enter feed water pressure in pounds per square inch (psi) PSI* Temperature Enter feed water temperature in Celsius or Fahrenheit C F* Results   Expected Production: gpd *Feed water dissolved solids concentration is assumed to be 250 ppm. Permeate flow from FILMTEC membranes may vary ± 20%.

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