1.

The rate of filtration of a slow sand filter ranges from

A. 10 to 100 L/h/m2
B. 100 to 200 L/h/m2
C. 200 to 400 L/h/m2
D. 400 to 1000 L/h/m2
Answer» C. 200 to 400 L/h/m2


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