The rate of filtration in slow sand filters in million litres per day per hectare is about
A. 50 to 60
B. 100 to 150
C. 500 to 600
D. 1400 to 1500
Answer:A
The rate of filtration in slow sand filters in million litres per day per hectare is about
A. 50 to 60 B. 100 to 150 C. 500 to 600 D. 1400 to 1500