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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.
Treating water protects our health by making sure safe drinking water is supplied to Melbourne. Most of our drinking water needs very little treatment, as it comes from protected catchments which supply high quality water. This water is disinfected as it leaves our storage reservoirs and enters the supply system.hlorine, chloramine (chlorine and ammonia) or ultraviolet light are used to destroy any disease-causing bacteria. The amount of chlorine added varies, but is typically less than one milligram per litre (0.0001%), or one sugar grain in a cup of water.