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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.
Drinking water. In countries with poor sanitation, don't drink tap water or use it to brush your teeth unless it has been treated. Filtered, bottled, boiled or chemically treated water should be used. Bottled fizzy drinks with an intact seal are usually safe, as are boiled water and hot drinks made with boiled water.