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There was an article in a magazine a while back (I think Scale Auto) that described how to make a carbon/water filter. I'm sorry I don't recall all of the details, but it would be what you're looking for.
The general idea was that the exhaust air was pumped into a pail of water that had filter charcoal in the bottom of it. Apparently this cleans it all up.
Anyone else recall this or know more details about this?? Maybe a google search would turn up more info for you.
Murray
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