I have 7 large litter boxes and 1 small one for 8 cats. I use a scoopable scented litter and scoop twice a day. Every week, I change all of the litter.

Of course, most of them would rather go outside in the pen---which I scoop once a week. But I still haven't been able to eliminate the odor outside. I've been using Arm & Hammer cat deodorizer, but it hasn't helped a lot.

Mary