Which of the following statement is correct ? -
(a) Slow sand filters work under atmospheric pressure
(b) Rapid sand filters require coagulation
(c) Rapid sand filters should be cleaned after 2 to 3 days
(d) all of the above.
The correct Answer Is
(d) all of the above
(a) Slow sand filters work under atmospheric pressure
(b) Rapid sand filters require coagulation
(c) Rapid sand filters should be cleaned after 2 to 3 days
(d) all of the above.
The correct Answer Is
(d) all of the above
