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Table 1 Factors and their levels for removal of fluoride using full factorial design

From: Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Factors Code Minimum level Intermediate level Maximum level
Dosage (g/100 mL) X1 0.5 1 1.5
pH X2 2 7 9
Contact time (min.) X3 60 90 120