Double filtration is used
A. to increase the filtration slow sand filters capacity of
B. to increase the filtration rapid sand filters capacity of
C. for isolated buildings like pools, hotels etc swimming
D. all of the above
Answer:A
Double filtration is used
A. to increase the filtration slow sand filters capacity of B. to increase the filtration rapid sand filters capacity of C. for isolated buildings like pools, hotels etc swimming D. all of the above