The function of alum is used for purification of water is to
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ALUMINIUM SULFATE OR ALUM IS USED AS A FLOCCULANT TO REMOVE UNWANTED COLOUR AND TURBIDITY FROM WATER SUPPLIES. IT HAS BEEN USED SINCE ANCIENT TIMES FOR THIS PURPOSE AND ITS USE TOGETHER WITH FILTRATION IS STANDARD PRACTICE IN CONVENTIONAL WATER TREATMENT PROCESSES AROUND THE WORLD.
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