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| Q.47 | Select the main feature of slow sand filter following CPHEO guidelines. | |
| Ans | A. Rate of filtration ranging from 100 to 150 m3/m2/day. | |
| B. Uniformity coefficient of sand ranges between 1.3 to 1.7. | ||
| C. Removal efficiency of bacteria in raw water is better than rapid sand filter. | ||
| D. Depth of sand ranges between 60 to 75 cm. |
Correct Ans Provided: C
