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United States Environmental Protection Agency
Drinking Water & Ground Water Kids' Stuff
Begin Hierarchical Links EPA Home > Water > Ground Water & Drinking Water > Kids' Stuff > > Water Treatment Process > Coagulation End Hierarchical Links



Coagulation removes dirt and other particles suspended in water. Alum and other chemicals are added to water to form tiny sticky particles called "floc" which attract the dirt particles. The combined weight of the dirt and the alum (floc) become heavy enough to sink to the bottom during sedimentation.

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