Gross! Also… a large part of the granules get flushed down the rest room. I haven’t researched those accurately… but I am able to’t imagine that it's great on your plumbing. The granules appear to be plastic. Possibly they biodegrade? Idk.. not my fav. We are on the lookout in https://bookmarking1.com/story20190709/the-smart-trick-of-automatic-litter-box-that-no-one-is-discussing