Aluminium sulfate (alum), a white to off-white solid or solution, widely used as a coagulant in water and wastewater treatment and in paper sizing.
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Aluminium sulfate, commonly called alum, is supplied as a white to off-white granular solid, slab or liquid solution. It dissolves to give an acidic solution and hydrolyses to form aluminium hydroxide flocs that aggregate fine suspended solids and colour.
Typical applications include:
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