Question

please tell me how to use alum in water purification process

Answer 1

take a piece of alum and stir it in the water, the dust particles are absorbed by the piece of alum and the water is purified

Answer 2

Aluminium Sulfate, Shortly known as Alum, when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate. This floc attracts other fine particles and suspended material in raw water, and settles down at the bottom of the container.