I've been using the ScoopFree (http://www.petsafe.net/scoopfree http://www.petsafe.net/scoopfree) boxes for about six years now with no problems. Before that, I

I've been using the ScoopFree (http://www.petsafe.net/scoopfree http://www.petsafe.net/scoopfree) boxes for about six years now with no problems. Before that, I had some other brand that was mostly ok, though not as good. There are obviously plenty of other alternatives the author hasn't considered that don't cook poop and do a great job.