I posted a link to a great bong setup on another forum a couple of weeks ago (titled "Ohmygod looky at this bong!!!" or something like that). That shows essentially how to make a decent CLOSED LOOP bong setup. As far as humidity goes, with a setup like he described, you could even set up the bong outside of your house if you wanted to and not worry about water contamination. The coolant is isolated from the bong water. All you need to do with a system like that is hose it out every once in a while and viola!
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