Distilled is pure, about as pure as you can get. It is water that was heated and the steam that escapes is captured, it condenses, and this is distilled water. All minerals and pollutants are left behind, when it evaporates, as does chlorine. Chlorine, if you insist it's in there, will gas off, if you leave the lid off your water bucket for a couple days. With distilled water, this is not needed.