If the RWC is &lt;25% effluent the concentrations may  (1) 4 times the RWC, (2) 2 times the RWC, (3) RWC, (4) RWC/2, and (5) RWC/4.
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If the RWC is under 25%, the concentrations vary.
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Even if the RWC is under 25%, the concentrations do vary.