Purification of water at large scale is done by all except: (A) Disinfection of well, (B) Rapid sand filter, (C) Slow sand filter, (D) Storage
Answer is A. Purification of water on a large scale Storage Filtration by slow sand or biological filters rapid sand or mechanical filters 3. Disinfection Purification of water on a small scale Household purification of water Disinfection of wells (refer pg:771 park 25th edition)