Question

The slow sand filter is able to remove ______ % of bacteria in water.

(a) 90

(b) 95

(c) 98-99

(d) 100

I got this question in an interview for internship.

This key question is from Slow Sand Filter topic in chapter Filtration of Environmental Engineering

Answer 1

Correct choice is (c) 98-99

For explanation I would say: The slow sand filters are highly efficient in the removal of bacteria and can remove around 98-99% of bacteria present in water.