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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.
Reverse Osmosis Treatment for Drinking Water. Other fact sheets in this series identify reverse osmosis, commonly called RO, as a treatment process for. removing many different contaminants. RO is more generally used for small volumes of drinking water. This document provides greater detail concerning RO treatment.