The Ezi-LockOdour Dual Layer Cat Litter System is a revolutionary design in litter trays that offers superior odour control. This litter system uses naural mineral zeolite pellets which have micropores to help dehydrate moisture while allowing liqiud to pass through to the absorbant pad below. These pellets have been shown to leave an 11 times smaller waste footprint than paper pellets and only need to be changed once a month. The Ezi-LockOdour Dual Layer Cat Litter System also uses an absorbant pad which is placed in the slide-out tray at the bottom of the litter system. This pad works to immediately absorb and lock away both liquid and odour and is quick and easy to change once a week. While the Ezi-LockOdour Cat Litter System Natural Mineral Zeolite Pellets and Ezi-LockOdour Cat Litter System Absorbant Cat Pads are sold seperately, the Ezi-LockOdour Dual Layer Cat Litter System includes a a scoop and it comes with everything you need to get you started to a month which includes a 2L bag of pellets and a pack of 4 absorbant pads.