Odour Eating Probiotics Natural 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 non-toxic method to deliver brilliant odour control. Breeder's Choice Plus Cat Litter can be composted once the waste is removed, but we recommend that you check with your local council for guidelines. Biodegradable & Compostable** **Remove Waste - Check with local council