The distillation process removes almost all impurities from water. However, properly equipped distillers can reduce VOC concentrations effectively. Also bacteria can accumulate in a distiller's cooling coils when the distiller has not been used for a period of time. Distillers remove almost all of the impurities found in water, produce sodium-free water if needed for health reasons, and are relatively easy to maintain. Most distillers are mechanically simple.
Distillers have small capacities and use considerable energy to process water.
Heat generated by a distiller must be dissipated into the surrounding environment. Before you buy any water treatment unit you should know what impurities are found in your water supply. The results of the water test will help determine the best water treatment system to use. These tests should be done on a regular basis. If you suspect a problem, test the water more often.