The self-cleaning cat litter box Sponge is an innovative device for pet owners that frees you from one of the less pleasant tasks. This smart cat litter box cleans itself after each visit from your pet, separating the litter from the waste, which is collected in a bag in a separate, airtight container. All you have to do is throw away the bag while the litter remains clean in the box. This way, you can keep your cat's litter box fresh and clean for longer.