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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.
Surface Water Treatment Rule If a public water system uses a lake, river, stream or pond as it's water source, then it is regulated by the Surface Water Treatment Rule. This rule seeks to prevent waterborne diseases caused by viruses, Legionella, and Giardia lamblia.