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Preliminary Treatment

screens may be used to remove rocks, sticks, leaves and other debris; chemicals may be added to control the growth of algae; and a presedimentation stage can settle out sand, grit and gravel from raw water.

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Filtration

Turbidity is a physical characteristic that makes water appear cloudy when suspended matter is present. The filtration process removes suspended matter, which can consist of floc, microorganisms.

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Tertiary treatment

Disinfection is normally the last step in purifying drinking water. Water is disinfected to destroy any pathogens which pass through the filters.Possible pathogens include viruses, bacteria.