what does the exhaust from your carbon filter smell like?? when I first made mine and tested it, the exhaust smelled like carbon. I've been using the filter for a month or so now for veging, and I swear, it smells like fresh cake! it's a very sweet smell. do I not have enough carbon in my filter or something? is the carbon not removing all of the smell and leaving the sweet smelling part, or is it just a byproduct of how it works? I don't think it smells like the plants, it just smells really good, like fresh moist sweet cake. either my filter's not working, or I'm whack..