Sol, when you run your still do you blow-off the first steam to the air for 
several minutes before you turn the steam into the condensing coils?
   
  If not many components that you don't want go over into your final product.
   
  I knew a doctor in New Orleans who could not use Mississippi river water even 
if tripple sitilled. He had to buy water from Washington state to make his lab 
reagents for tropical medicine  use.
   
  "Ole Bob"