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 Osmotic Pressure Is - The flow of water through a membrane in response to differing concentrations of solutes on either side generates a pressure across the membrane, which is 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 and Temperature Compensation - In order to characterize a membrane, there must be common testing data. Industry standards for testing membrane performance are 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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