Materials that have a higher boiling point than water will not rise with the steam. Most contaminates have a higher boiling point than water and therefore will not rise with the steam. Chlorine, however, is one substance that has a lower boiling point than water. Fortunately, we can easily filter chlorine out through an inexpensive carbon filter after distillation. Most modern distillers are built with a post carbon filter to filter out chlorine.
Distilled water filtered through a post carbon filter is the purest water available.
It contains very little foreign particles, chemicals, minerals, bacteria or other contaminants. There seems to be a big controversy regarding drinking distilled water. We often hear people say distilled water doesn't contain valuable minerals. The minerals found in water are inorganic and the body can't assimilate most of them. Inorganic minerals not assimilated causes mineral deposits in the body.