I have tried several different pellets and my choice for my Quadrafire Castile is Turman. Made in Virginia from Oak that is leftover from a flooring manufacturer. They burn hot and clean with very little white to gray fluffy ash. Never any clinkers and no black soot. I have tried others when I run out at the end of the season(from hardware stores and bog box stores) and most of them were terrible. High ash content and left alot of black greasy soot on my stove insides.