In chemical terms, what are alums used for purifying water for drinking purposes ?

In chemical terms, what are alums used for purifying water for drinking purposes ? Correct Answer Double sulphates

Alum is double sulphates having the composition M2SO4. M2(SO4)3.24H2O.Where M stands for monovalent basic radicals. Alums have Germicide properties and thus used in purification of water.

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