Gross! Also… a considerable part of the granules get flushed down the toilet. I haven’t investigated These specifically… but I am able to’t imagine that it's fantastic in your plumbing. The granules seem to be plastic. Perhaps they biodegrade? Idk.. not my fav. We are wanting in to other devices. https://petskyonline-onlinestrore.blogspot.com/2025/07/petkit-purobot-ultra-premier-auto.html