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Table 1

Coded and actual levels of independent variables

Coded levels
Independent variable −1.414 −1 +1 +1.414 
Actual levels
pH 6.7 6.8 7.1 7.4 7.5 
Coagulant dose (g/L) 5.2 5.5 5.8 
Coded levels
Independent variable −1.414 −1 +1 +1.414 
Actual levels
pH 6.7 6.8 7.1 7.4 7.5 
Coagulant dose (g/L) 5.2 5.5 5.8 
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