I need to reply to my own post to clarify something. RO systems will work to remove all types of contaminants (my 99 + %), but will not remove 100% (or at least will not be represented to) of any contaminant. Go to the performance sheet of whatever RO unit you are considering and you can see how it performs. Apparently most bottled water suppliers that uses municipal systems as a source, uses RO and carbon filters and UV, but I don't think many or any would actually certify that they have "zero" contaminants.
When Federal or State requirements set a Public Health Goal for potential carcinogens, it is usually a very low number that they estimate to the best of their ability will result in no more than one additional cancer case in one million people who drink something like 2 liters of water a day for 60 years as I understand it.
If you are on a public water supply go to Consumer Confidence Report for your water supplier (2015 is the most recent) and you can get a pretty good idea of what is in your water.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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