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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