Gross! Also… a big part of the granules get flushed down the rest room. I haven’t investigated those specifically… but I am able to’t think about that it's superior on your plumbing. The granules seem to be plastic. Perhaps they biodegrade? Idk.. not my fav. We're on the lookout in https://petskyonline-onlinestrore.blogspot.com/2025/07/petkit-purobot-ultra-premier-auto.html