What is the rate of backwash water?

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Question

What is the rate of backwash water?

Options:

A . 0.3-1 m/min

B . 1-1.5 m/min

C . 0.03-0.3 m/min

D . 15-3 m/min

Answer: Option A
Answer: (a).0.3-1 m/min

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