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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.
A problem that you will encounter during an emergency or disaster is not only obtaining water to drink, but treating it to make the water safe to drink. The best way to treat water for drinking is to boil it first, for one minute. According to the Wilderness Medical Society, water temperatures above 160Â° F (70Â° C) kill all pathogens within 30 minutes and above 185Â° F (85Â° C) within a few minutes.