I have been burning both LaCretes and Green supremes (yeah I know most folks hate 'em) for weeks and just recently been waking up to clogged pot w/ a piece of firm "brownie" stuck in the bottom. It was so stuffed that the pellets were starting to clog the end of the chute! Pulled pot and took a hard wired brush to it and found no more than 2-3 air holes sealed w/ carbon. I figured that wouldn't be enough to affect the flame but I was dead wrong. Started burning G Supremes again for 10 hours and the flame burned clean w/ little "brownie residue...live and learn I guess! Happy New year all!