Question

In which type of filter, rate of filtration is low?

(a) Slow sand filter

(b) Rapid sand filter

(c) Gravity filter

(d) Pressure filter

This question was addressed to me in an interview for internship.

The origin of the question is Theory and classification of Filtration topic in portion Filtration of Environmental Engineering

Answer 1

Correct choice is (a) Slow sand filter

To elaborate: In Slow sand filter, rate of filtration is low and due to this they requires large land and are expensive to install.