HI, I am a transplant patient who was grandfarthered in for having 4 cats when I got my transplant. 15 years. But I was forbidden to clean the litterbox.(due to exposure to fungi risk) When I discovered the CatGenie I was excited since my ex wife was gone and I had to clean up. Now all I have to do is replenish the granules and only used 1 1/3 box in 8 months. I read a tip to sweep up the wayward granules with a broom in the bathroom and outer hall, they do end up everywhere. But they don't hurt your feet when stepped on like litter does. I only had one problem the water sensors went bad, but Catgenie shipped out a new processor in 2 days with return shipping. Cost me nothing, and technical support is great!