The PetSafe Deluxe Crystal Litter Box System is an innovative litter box that is designed to work specifically with crystal litter. At the beginning of the month, simply fill the box with one bag of PetSafe Premium Crystal Litter. As your cat uses the box, the crystal litter will absorb urine and dehydrate solid waste to control odours. The tray is lined with an absorbent pee pad that acts as an extra layer of protection catching any urine that the crystal litter does not immediately absorb. Vents along the underside of the litter box encourage airflow beneath the crystal litter to extend the life and freshness of the litter. Use the included scoop to dispose of solid waste daily, and the anti-tracking grid on the front of the litter box will keep litter inside the box and off your floor. One bag of crystal litter will last up to one month in a single cat household. Simply empty the box at the end of the month, clean it out and refill with another bag of crystal litter for another month of unbeatable odour control.