why alum is added
to water
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When alum (Aluminium Sulphate) is added to raw water, it reacts with the bicarbonate alkalinities present in the 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.
Answered by
1
ANSWER :-
When alum (Aluminium Sulphate) is added to raw water, it reacts with the bicarbonate alkalinities present in the 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.
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