I found some moldy wood pellets in mine after they had gotten wet at home. Fortunately I don't have allergies to it so I just used my sifter to get rid of the bad stuff. Now I'm also sifting the new scoop of pellets before I add it to the old, because there is a bit of loose dust. You can make your own sifter for less than $5 or use an Oneida over the sink strainer that Target and Kohl's sells for $20. The holes are relatively large. Anyone new who would like my plan to make one just email me with your request. Carol Owens, Tucson [log in to unmask] [Posted in FML issue 4687]