Found softwood pellets and tried them tonight has been burning for 5 hrs now and wow what a difference no build up as of yet..... I actually got scared never saw the stove burn this way thought it was going to go out..... I guess I'm so use to the burn pot filling up I never really got to see how it's suppose to burn when it's burning correctly..... And above it all the exhaust smells better lol..... I'll keep u guys updated but so far so good.... The place I got these pine pellets from only has three ton left so looks like I'll be buying them if everything goes good tonight