I literally picked out small shards of glass in my kitties liter boxes!! I just cleaned out the box and saw pieces shining from the light, so I picked it up and it was GLASS! I've seen pieces shining before but just thought it was the way the light was hitting the liter. I'm changing liter tomorrow! It's Dr. Elseys. I'm calling the company also. But I wanted to post this in case anyone uses this liter. Make sure you check!!!!!