I use a 5 stage RO system for my misting water, and a HMA system for other water. Both use carbon, as do water companies in the treatment process, spring water bottling plants etc etc etc. Like it or not, at some point your water has been filtered with carbon. lol Oh and it's a 5 stage system as it doubles up for drinking water, complete with pressure tank, auto shut off valve and faucet. Making it much more useful, given our tap water here is absolutely disgusting! Within a day of fitting both my HMA and RO system the white 5 micron prefilters on them were a nice orangey brown from all of the rust particles.
Ade