Purified water is water that has been mechanically filtered or processed to remove impurities and contaminants like bacteria, chemicals, and toxins from tap water. Filtered water involved running water through a type of filter, carbon filters being the most common. Carbon filters remove chlorine and improve the water’s taste. In these filters, the activated carbon helps remove unwanted contaminants like pesticides and arsenic, but leave minerals in.  Read a full description here.