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??