Question

study of the methods of purification of water

Answer 1

physical methods ---
* filtration
* sedimentation
* distillation
chemical methods---
* flocculation
* chlorination

Answer 2

When reverse osmosis is not available, there are 4 water purification methods that you can use to make your water safe for drinking.
1) Boiling: Boiling water is the cheapest and safest method of water purification....
2) Filtration...
3) Distillation....
4) Chlorination......

Hope it helps!!!!!!!