1 Settling Large materials settle out. Raw water reservoir Coagulant added 2 Coagulation Alum or other added chemicals combine with suspended material to form clumps. Flocculation tank 3 Sedimentation The coagulated materials settle to the bottom. Sedimentation tank 4 Filtration Sand and gravel filters remove microorganisms including protozoan cysts and 0ocysts. Activated charcoal filters remove dissolved chemicals. Filtration unit Disinfectant added 5 Disinfection and Storage Chlorine, ozone, or other chemical disinfectants are added. UV irradiation may also be used to destroy microbes. Reservoir can eause img merely Methe Consumer use inelude: FIGURE 29.6 Treatment of Municipal Water Supplies

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