text: 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 go up and down up to 50 % .