As compared to rapid sand filters, slow sand filters give______________?
As compared to rapid sand filters, slow sand filters give______________?
1) slower filtration rate
2) higher filtration rate
3) lesser efficiency in removal of bacteria
4) higher efficiency in removal of bacteria
The correct answer is?
A. (1) and (2)
B. (2) and (3)
C. (1) and (4)
D. (2) and (4)