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12. Jar test is conducting on a raw water, the following data summarize the results, the optimum coagulant dose in (mg/l) is: a) 20.0 b)

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12. Jar test is conducting on a raw water, the following data summarize the results, the optimum coagulant dose in (mg/l) is: a) 20.0 b) 40.0 c) 5.0 d) 50.0 e)None Jar# 2 3 5 5.0 10.0 50.0 30.0 Alum dosage (mg/L) Turbidity (NTU) 40.0 250.0 135.0 50.0 175.0 210.0

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