Alum or Aluminium sulfate is a salt with the formula Al₂(SO₄)₃. It is soluble in water and is mainly used as a coagulating agent in the purification of drinking water and wastewater treatment plants, and also in paper manufacturing.

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Aluminium sulfate (Alum)  is a salt with the formula Al₂(SO₄)₃. It is soluble in water and is mainly used as a coagulating agent in the purification of drinking water and wastewater treatment plants, and also in paper manufacturing.