Coagulants remove or add electrical charges, which allow the particles to stick together.  Most particles in a typical solution of water that requires treatment are negatively charged particles.This process is called flocculation. A variety of things could be used as a coagulant which includes polymers.

After flocculation of these particles occur they travel to a secondary clarifier to settle out.

coagulant 1

coagulant 2

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