This amazing litter box saves the mining of clay litter or the exposure of GMO wheat or corn in the form of alternative clumping litters and, instead, uses recycled plastic pellets that are washed, sanitized and dried through its cleaning cycle (you hook it up to your water line and electricity in either the bathroom or laundry). It's pricey, but if it saves me having to haul over 40 pounds of litter a month. As for the water, it uses less than me having to flush the hand-scooped waste and I'm on 100% green electricity, so the guilt is minimized. Out of my four cats, two love it and two are suspicious. But I have faith that once I get rid of the small "backup" box, they'll all cooperate. Fingers crossed.