Reverse Osmosis, as I understand it, is filtration on a microscopic level. It removes any molecules larger than the H2O molecule. So anything smaller is free to pass through along with the water molecules.
A few years back I worked at a place with an E-Coat paint system. It involved the use of many chemicals, so the city got involved with what could be put down the drain.
One of the biggest concerns was "dissolved heavy metals" which could not be put down the drain. We had to install a complex filtration system to separate them out. At the time we were told there was no filtration system that could catch dissolved (attached) metals. What we had to do was add another chemical that would attach to the contaminated molecules and make them large enough for the filter membrane to catch them, a process called "flocking".
As far as I know, that still applies, that dissolved metals cannot be filtered out without a secondary process.
Possibly a water analysis could tell what contaminates you have, and what process is needed to make it safe.
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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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