Gross! Also… a substantial portion of the granules get flushed down the bathroom. I haven’t investigated Individuals precisely… but I am able to’t picture that it's great in your plumbing. The granules seem to be plastic. Possibly they biodegrade? Idk.. not my fav. We've been seeking in to other units. https://ragingbookmarks.com/story20202888/a-simple-key-for-robotic-pet-cleaning-unveiled