Why do we add alum to purify water?

Question:

Why do we add alum to purify water?

Solution:

Alum is KAl(SO4)2 which is called potassium aluminium sulphate. when added react with alkaline bicarbonates and forms a gelatinous precipitate. When it is added to

water they attract the colloidal particles and settles down at the bottom of the container.

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