A few years ago , the PFI quality guarantee mark appeared on the bags of most pellet manufacturers. I checked a few recent bags I had saved, two or three local brands, and the PFI quality certification has disappeared..I checked the PFI web-site and the number of brands they certify has dropped to just a relative handful of predominantly east of the Mississippi pellet providers...Recent bags purchased in Denver still claim "Premium Quality" but no longer is there any mention of BTU content, ash content, fines content, moisture content. I don't know if the PFI guarantee was worth much but now we have even less than that...One of the long-time members, boglieb I think, ran an amazing test and analysis of many different pellet brands which at least gives you an idea of what works and what does not....