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Coagulation is a process in which a coagulant disperses in the forms of ions (preferably positive charged ions) while mixing in water or other aqueous solution. Dispersed ions of coagulant neutralizes or destabilizes  negatively charged colloidal particles suspended in the solution.

Flocculation is a process in which a coagulant produces gelatinous precipitate (called floc) generally hydroxide compound which has property of arresting suspended impurities in water or aqueous solution. These flocs ( in the shape of balls) become heavy with adhered (adsorbed) impurities and settle down during its downward motion towards bottom of the vessel. This processes is called Flocculation. 

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