In rapid sand filters, the depth of tank varies in between

1.	In rapid sand filters, the depth of tank varies in between
A.	1 m to 2 m
B.	2.5 m to 3.5 m
C.	3 m to 3.5 m
D.	0.6 m to 0.9 m
Answer» C. 3 m to 3.5 m

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In rapid sand filters, the depth of tank varies in between

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