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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.
bleach is a powerful chlorine disinfectant and drinking it can cause severe injury or death but a tiny amount is often used to purify cont aminated water bleach is used to kill bacteria in rv water tanks and when there is no other way such as boiling to make water safe for drinking