Q.

What is the maximum allowable flow for backwash?

A. 20 m/hr
B. 45 m/hr
C. 60 m/hr
D. 80 m/hr
Answer» C. 60 m/hr
Explanation: the maximum allowable water flow for backwash is 60 m/hr. the recommended water flow for backwash is 45 m/hr.
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