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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.
1 If boiling water is not possible, a combination of filtration and chemical disinfection is the most effective pathogen reduction method in drinking water for backcountry or travel use.2  Manufacturerâs instructions must be followed. Methods that may remove some or all of viruses from drinking water are: 2  Boiling (Rolling boil for 1 minute minimum) has a very high effectiveness in killing viruses; 3  Filtration is not effective in removing viruses; 4  Disinfection with iodine or chlorine has a high effectiveness in killing viruses;