6
Spectrum
TM
Rejection, Recovery &
Flow Rates
The amount of total dissolved solids (TDS) rejected by the membrane is expressed as a percentage. For
example, a 98.5% rejection rate means that 98.5% of the total dissolved solids do not pass through the
membrane. To calculate the % rejection use the following formula:
% Rejection = [(Feed TDS - Product TDS) / Feed TDS] x 100
Example:
98.5% = [(550-8.25) / 550] x 100
NOTE:
All TDS figures must be expressed in the same units, typically parts per million (ppm)
or milligrams per litre (mg/l).
SPECTRUM Reverse Osmosis Systems are designed to reject up to 98.5% NaCl unless computer projections
have been provided or stated otherwise.
The amount of permeate water recovered for use is expressed as a percentage. To calculate % recovery
use the following formula:
% Re
covery
= (Product Water Flow Rate / Feed Water Flow Rate) x 100
Example:
50% = (1.02/2.04) x 100
NOTE:
All flow rates must be expressed in the same units, typically litres per minute (lpm).
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