Q. The under drainage system in a rapid sand filters (Solved)
1. receives and collects the filtered water
2. allows back washing for cleaning the filter
3. both (a) and (b)
4. none of these
- c. both (a) and (b)
1. receives and collects the filtered water
2. allows back washing for cleaning the filter
3. both (a) and (b)
4. none of these