1. Water treatment:Aluminium sulfate is used in water purification it causes impurities to coagulate into      larger particles and then settle to the bottom of the container (or be filtered out)
2.Textile: In dyeing and printing cloth, the gelatinous precipitate helps the dye adhere to the clothing fibers   by rendering the pigment insoluble.
3. Aluminium sulfate is sometimes used to reduce the pH of garden soil
4. Aluminium sulfate also can used in medicine and food,etc.
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