Gross! Also… a substantial portion of the granules get flushed down the bathroom. I haven’t investigated These exactly… but I am able to’t envision that it's good in your plumbing. The granules seem to be plastic. Possibly they biodegrade? Idk.. not my fav. We are searching in to other systems. https://ragingbookmarks.com/story20185142/helping-the-others-realize-the-advantages-of-petkit-review