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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.
Distilled Water VS Purified Water. You are here: Water that is treated by a water filter or purifier is similar to distilled water, but the main difference is in the filtration process. Distilled water is filtered by boiling water to separate the water molecules from contaminants and hard minerals. The pure water vapor is collected on one side of the water distiller and any other contaminants are left behind.