The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?

A. 40,000 to 50,000 litres/sqm/day

B. 80,000 to 100,000 litres/sqm/day

C. 50,000 to 60,000 litres/sqm/day

D. 25,000 to 35,000 litres/sqm/day

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