Contaminant reduction claims are true. System does not add anything harmful to the water. System is structurally sound. Advertising, literature and labeling are not misleading. The materials and manufacturing process used don't change, meaning consistent product quality over time.
All distillers go through the process of distillation.
One brand distiller will not significantly make purer water than another brand. Pyrex Glass is the cleanest material to heat water without adding contaminates back into the water. The problem with glass is that it's not durable and will crack if you drop it. We don't recommend using heat resistant plastic or aluminum. In this day and age, it's almost impossible to find water that hasn't been contaminated.