I'm forwarding this provocative article for feedback.
I found the article of particular interest for those of us who make our own CS 
from distilled water...from any source.
A total dissolved PM reading, on a  PPM scale may not indicate any VOCs or DBPs 
as the article states (which are dangerous at PPB levels). But, then, we're not 
typically swigging glassfulls of CS a day either.
Any thoughts? thanks, and have a happy!! 

http://articles.mercola.com/sites/articles/archive/2010/12/18/distilled-water-interview.aspx