Coagulation: destabilization of colloids by neutralization of electrical charges. Common reagents:

- Aluminum sulphate (alum)

- WAC (Basic aluminum chloride)

- Ferric chloride

- Ferric chlorosulfate

Flocculation: agglomeration of neutralized particles. This phenomenon is naturally slow. It can be accelerated by the addition of reagents called flocculation adjuvants.

- Activated silica.

- Alginate

- Mineral Charges

- Starch

- Anionic polyelectrolytes