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				| 1. | While designing a blower for backwash for dual media filters without air scouring what is the velocity considered? | 
| A. | t36 m/h | 
| B. | t30 m/h | 
| C. | t24 m/h | 
| D. | t20 m/h | 
| Answer» C. t24 m/h | |