Gross! Also… a substantial portion of the granules get flushed down the rest room. I haven’t researched those just… but I can’t imagine that it is good for your personal plumbing. The granules seem to be plastic. It's possible they biodegrade? Idk.. not my fav. We're on the lookout in https://admiralbookmarks.com/story20227379/petkit-review-an-overview