The Works bleach automatic toilet bowl cleaner kills 99.9% of bacteria in the toilet bowl while cleaning and deodorizing for over three months. Using the power of chlorine bleach, The Works automatic toilet bowl cleaner kills 99.9% of germs. Its patented technology slowly releases a concentrated cleaning agent that reduces the need for difficult brushing and maintains a clean toilet bowl for up to 11 weeks. Plus, it won't harm plumbing or septic systems and can be used in both white and colored toilets. The Works Automatic toilet bowl cleaner's long-lasting formula keeps your toilet bowl clean up to 20% longer than other national brands. Just drop it in your tank and let us go to work for you. The Works automatic toilet bowl cleaner is quick, easy to use and priced at a value to save you time and money.