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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 US Center for Disease Control notes: âExcept for boiling, few of the water treatment methods are 100% effective in removing all pathogens.â. Safe water is one of the biggest concerns for travelers and expats. There are two types of threats in drinking water: Organic contamination: protozoa, bacteria, viruses.