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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.
Water is potable when it is safe for drinking by humans and other animals. Rainwater and even seawater can be processed into potable drinking water at a water filtration plant. Minute amounts of bleach can be added to water to purify it. Campers might use purification tablets to make small amounts of potable water.