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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.
The only healthy and safe way to drink ordinary tap water is to use a water purification. Chemical Sources. Chemicals will enter into tap water from many different types of sources. Pollution is one way that chemicals have gotten into the tap water supplies.Other ways are when chemicals are added to the water by the public water systems. The most common of these chemicals is chlorine. Chlorine is the most common of the types of chemicals currently being used to treat public water supplies.It is used to remove and to kill any bacteria which could be living in the water.ver time, chlorine taken in small doses will increase the risk of cancer, heart disease and other health conditions. Most all public drinking water systems use chlorine to purify water. Other chemicals which are found in drinking water are equally as deadly.