Biodegradable & Compostable****Remove Waste.Check with local councilNatural probiotics feed off the bacteria in your litter tray to help eliminate bad smells.Breeder's Choice Plus Probiotics combines your favourite cat litter with naturally occurring probiotics that feed on the bacteria in litter trays to help eliminate bad smells, keeping the litter tray and your home smelling clean and fresh. It is a natural and nontoxic method to deliver brilliant odour control