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| Q. |
A slow sand filter is cleaned if its filter head is higher than |
| A. | 10 cm to 20 cm |
| B. | 20 cm to 40 cm |
| C. | 40 cm to 70 cm |
| D. | 70 cm to 120 cm |
| Answer» D. 70 cm to 120 cm | |
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