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				| 1. | Calculate the flow of backwash pump required for the activated carbon filter for the following details.Flow: 2500 m3/h.Rise Velocity: 15m/hBackwash pump velocity: 24 m/h | 
| A. | 2500 m3/h | 
| B. | 3500 m3/h | 
| C. | 4000 m3/h | 
| D. | 4500 m3/h | 
| Answer» D. 4500 m3/h | |