Altough i only have 1 cat I have 3 ferrets as well & they all share litter boxes, so i use a combination of kiln dried wood pellets (used to be the ferts litter before the cat came along & since i didnt want the ferts to rebel I just mix them) & tidy cat for multiple cats (i ussually use the kind with immediate odor control) non scoopable though cause the ferts but i have never had a problem with smell or anything. I love my mixture!

The pellets make it kind of scoopable, so i scoop all 9 litterboxes for 1-2 days then on the 2nd or 3rd day I just empty all of them.