We have tried several brands of wood pellets for our wood pellet stove and the "Fuel King" brand is one of the worst. If the store is out of one kind we have to settle for what they have on hand at the time. This has to do with the fast build up in the ash pan when other brands take 4-5 days to show any build up to speak of.. After using "Fuel King" the ash pan has to be cleaned out every day and we only use our wood stove as a back-up set on #4.