I got very lucky today. Because I read the forums I learned the importance of sifting pellets. I started sifting the whole bag lately and I am glad that I did. In the first 1/4 of a bag of Nautures Own by Premier Pellet Corp, I found a rock when pouring into the sifter. Thank goodness, I would've come home to either a seized auger motor or broken auger. OUCH