Manufacturers produce bottled water through several treatment processes, including distillation. Water is distilled in some home and industrial filtration processes as well. Distillation purifies water through evaporation, and it is one of the oldest known water treatment methods. Distillation units, also known as stills, heat water in a boiling chamber until it evaporates into steam. Condensing coils or a cooling chamber convert this steam back into liquid water.
Distillation removes contaminants that have lower boiling points than water. Heavy metals, nitrates, sodium, radionucleides, and organic compounds are left behind after evaporation. Unfortunately, distillation can't remove certain pesticides or volatile organic contaminants and solvents. These substances have higher boiling points and evaporate along with water. People looking for home water filtration systems need to consider possible contaminants, especially households with wells. Distillation is not a useful preventative measure in areas with widespread pesticide use.
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