One cubic metre of bone can treat how much quantity of water containing 3.5 ppm of fluoride?
(a) 10m^3
(b) 100m^3
(c) 1000m^3
(d) 10000m^3
I have been asked this question by my school teacher while I was bunking the class.
The above asked question is from Fluoridation and Defluoridation topic in section Miscellaneous Treatment Methods of Environmental Engineering