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In secondary treatment, bacteria are added to the wastewater to ingest organic solids, producing secondary sludge that settles to the bottom. Tertiary treatment filters the water to remove whatever solids remain, disinfects it with chlorine, and removes the salt.
Chlorine in Drinking WaterThe Good, the Bad, and the Ugly News. The addition of chlorine in drinking water has been the standard in water treatment in the United States since 1904. Thus, for over 100 years we have trusted and relied on chlorine to purify our water and kill off any waterborne pathogens.