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1. |
Calculate the area of the rapid sand filter for the following details.Flow: 2000 m3/h.Velocity: 5m/hBackwash time: 30 mins |
A. | 18 m2 |
B. | 20 m2 |
C. | 22 m2 |
D. | 16 m2 |
Answer» B. 20 m2 | |