Hi, yes I think it needs cleaned some, the coal is from same source but this load is higher in fine pecentage than before. Im using about 55 gallaon drum shy of a tone a week. Still have to get return ducted to house. I went with finer grind this time as had auger blocked before from to large of chunks. Trying to get 3/4 in standard size. Cant get stoker coal anyplace close to here so am using powder river basin coal. Have been mixing in anthracite in but It burns only about half before feed dumps it. clinkers are hard to see in the picture bt are fused and ring shaped.