I love PetSafe Premium ScoopFree Cat Litter! PetSafe Premium ScoopFree Cat Litter last up to 30 days in a single cat household as mine. It can be used in a standard litter box or as refills for the PetSafe  ScoopFree Self-Cleaning Litter Box and Reusable Litter Trays. It's low tracking and unlike clay litter seems to vacuum with ease. This is a big plus for me to not have the worry of dust, dander or particals floating throughout my home and settling in on my furniture. It doesn't mask the odor smell but eliminates it and goes a long way. I enjoy how it comes pre portioned and in 3 varieties, Original, Lavender, and Sensitive. If my kitty is happy, than I'm one happy kitty owner!!!