Ok so I'm burning a pel pro 120.. Btw I love it. 1st question is. I'm getting ash-biscuit"s in my burn pot after a day or two. Have used 4 diff brand of pellet s. same effect. 2nd question is - how do u know a good brand of pellets? Have burned 4 brands , all have burned well. All leave ash, and all leave a little sawdust in hopper? I started with sommerset, burned well but out of 6 bags 2 were nothing but full of sawdust. Then went to us pellets. Burned hot but very fast. (2 fast) then press to logs. Alot more ash then other 2. So then I bought a ton of American wood fibers for 195.50. They seem to be good. But how does one know? Amy advice is welcome.