What is the ratio of rate of back-washing to that of filtration in a typical rapid sand filter ?

What is the ratio of rate of back-washing to that of filtration in a t

1.	What is the ratio of rate of back-washing to that of filtration in a typical rapid sand filter ?
A.	2
B.	4
C.	6
D.	10
Answer» D. 10

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What is the ratio of rate of back-washing to that of filtration in a typical rapid sand filter ?

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