Powerful deodorization and sterilization, 99% effective (including COVID-19 virus), compliant with ISO 18184:2019 standard. Uses AOP-KF patented technology to effectively remove the odor of feces and urine from cat litter boxes and pet toilets. The formula is unique and contains AOF-KF exclusive patented technology, which can effectively deodorize and sterilize in various locations around the world. Safe to use, having passed additive tests and animal safety tests, and does not contain harmful substances. Usage:Take an appropriate amount of the product, use 50g for every 2.5kg of cat litter, and place it in the cat litter box or pet toilet.Replace every four weeks to maintain optimal deodorizing effectiveness and longevity.Adjust frequency of use as needed based on usage environment and litter box usage. Patent:US Patent: US10,183,187,B2China Patent: ZL2016 1 0010790.0