FAQ

FREQUENTLY ASKED QUESTIONS

% REJECTION CALCULATION FOR YOUR MEMBRANE

Use the calculator below to determine the percent rejection of your RO system.

Enter the TDS level of the product water
Enter the TDS level of the feed water
Percent Rejection = %

HOW TO CALCULATE ACTUAL PERFORMANCE FOR A REVERSE OSMOSIS MEMBRANE

  • What is Osmotic Pressure: The flow of water through a membrane in response to differing concentrations of solutes on either side generates a pressure across the membrane called osmotic pressure. In other words, as the hardness of the tap water increases, greater tap water pressure is required to force the water through the membrane.
  • Pressure & Temperature Compensation: In order to characterize a membrane, there must be common testing data. Industry standards to testing membrane performance is: 60 PSI tap pressure with 77 degree water temperature.
    Most locations will not have exactly 60 PSI or 77 degree water. Use the calculation below to determine what the membrane will do with your water conditions.

Click for performance calculation chart.

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