Alum or other Alum or other coagulant Polymer coagulant coagulant Polymer coagulant Influent Effluent Influent Effluent Optional mixing Filtration Flocculation Sedimentation Filtration T > 30 minutes R = 1 ??? 10 gpm/ft2 t = 15-30 minutes t = 1-4 hours t = 1-10 gpm/ft2 Rapid mixing Rapid mixing t = 30 minutes t = 30 minutes Water Filtration Water Filtration Direct Filtration Direct Filtration The