Gross! Also… a significant percentage of the granules get flushed down the toilet. I haven’t investigated These exactly… but I'm able to’t think about that it's very good for the plumbing. The granules appear to be plastic. Possibly they biodegrade? Idk.. not my fav. We're on the lookout in to https://7bookmarks.com/story20070871/top-guidelines-of-robotic-pet-cleaning