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When you see that the water is dirty, then you add some alum into it which helps it to be clean but have you ever thought why do we add alum into the water? How it cleans the water?
Let's know,
Alum is added to purify water. Alum means aluminum sulfate which acts as a coagulant. A coagulant attracts and binds with extremely fine and small particles to form a large particle.
When a solution of alum is added to impure water, it attracts and binds with contaminants and fine suspended particles of mud, dirt, etc. which forms large particles.
Being large, these particles can be removed by filtration, or when they settle down due to gravity, they can be removed through decantation, giving us pure water.
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