I have 2 Ton of Corinth pellets in lt blue bags. Burn with lots of ash and clinkers. I complained to company and they brought me 2 bags of newer pellets, which burned nice with less ash and no clinkers and are darker in color. I believe there is a difference in the pellets. They have offered to swap old pellets for newer ones, which I have agreed to. Also, said the blue bags are their newer bags.