Gross! Also… a large percentage of the granules get flushed down the toilet. I haven’t researched those exactly… but I am able to’t envision that it is superior on your plumbing. The granules seem to be plastic. Probably they biodegrade? Idk.. not my fav. We've been on the lookout in https://petskyonline-onlinestrore.blogspot.com/2025/07/petkit-purobot-ultra-premier-auto.html