ScoopFree litter tray cartridges keep your cat's litter box clean to maintain hygiene. They can be disposed off easily without leaving any trace of mess around the litter box. These disposable cat litter tray cartridges are ideal for use with ScoopFree self-cleaning litter and slide trays. Infused with premium blue crystals, they absorb wetness instantly, leaving the tray clean and dry. ScoopFree litter tray cartridges also seal in unpleasant odors to keep the room fresh.