Question

The final loss of head in slow sand filter is ______ than rapid sand filter.

(a) Higher

(b) Lower

(c) Slightly Lower

(d) Equivalent

The question was asked during an online interview.

My question is taken from Comparison Between Slow and Rapid Sand Filter in division Filtration of Environmental Engineering

Answer 1

The correct choice is (b) Lower

Explanation: The loss of head in slow sand filter lies between 15-100cm and of rapid sand filter lies between 30-300cm.The final loss of head in slow sand filter is 100cm while in rapid sand filter is 300cm.