Long time, no post. But now I'm back for a little help

I haven't had any plants for almost two years now, because I just haven't been able - legal issues.

But now I might start a plant or two, and I've been looking into some carbon filters when I stumbled into the FAQ here and saw this: http://boards.cannabis.com/grow-faqs...on-filter.html

So my question is, how do I use it when it is finished??
PaRaNoIa Reviewed by PaRaNoIa on . A little help needed. Long time, no post. But now I'm back for a little help :) I haven't had any plants for almost two years now, because I just haven't been able - legal issues. But now I might start a plant or two, and I've been looking into some carbon filters when I stumbled into the FAQ here and saw this: http://boards.cannabis.com/grow-faqs/99371-diy-how-carbon-filter.html So my question is, how do I use it when it is finished?? Rating: 5