water+treatment+webquest

= **Water Treatment Process - Disinfection** =  A small amount of chlorine is added or some other disinfection method is used to kill any bacteria or microorganisims that may be in the water.

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.