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