HOW IT WORKS & KEY BENEFITS: Boxie® Pro™ litters contain a proprietary blend of probiotics that naturally deodorize cat litter without harmful disinfectants, enzymatics or perfume cover-ups. Probiotic "good bacteria" compete with "bad bacteria" for sustenance, resulting in longer lasting, natural odor control. The proprietary blend of Boxie® Pro™ probiotics are commonly found in nature and are free of any harmful chemicals and additives, making it safe for pets and the environment.