A colorless styptic compound which is a hydrated double sulphate of aluminium and pottasium.. 
uses of alum :
-> pottasium alum is thecoomon alum of commerce, altough soda alum. ferric alum, and amonium alum are manufactured.
-> alum in block form can be used as a blood coagulant 
-> in nigeria it is used in the removal of snail slime before cooking
->solutions containing alum may be used to treat cloth, wood, paper materials to increase their resistance in fire
-> alum is also used in fire extinguishers to smother chemical and oil fires
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U can edit and write its uses too .. then ur answ. can be more attractive.
But Nice .. answert
alum is a chemical compound.the chemical formula of alum is KAl(SO4)2.

it is a water soluble compound.

it is used to purify water.

the process in which alum is used to settle harmful particles(sedimentation) is known as loading.
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please mark it as the best
a good question