Purification of water at large scale is done by all except
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)
Disinfection of well
Rapid sand filter
Slow sand filter
Storage
Environment and health