Since I have over 15 lbs sometimes to sift through I needed a heavy duty solution, I went to Orchard Supply and got the metal screen with holes maybe 1/8" square? I cut out the middle of a litterpan, leaving 2 inches or more all the way around of the bottom, cut a metal screen part the size of the entire bottom, placed it inside and duct taped it securely (using a lot of tape). The result: a sifter that pellets will not get through, ever! I had to change to this design when my pellet supplier started using ones that were skinny enough to fit through the cat scoops. Laryssa [Posted in FML 6655]