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 |