6. Why is alum added to water?
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Aluminium Sulfate, Shortly known asAlum, 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.
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It reacts with bicarbonate alkalinities present in water and forms a gelatinous precipitates
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