Cleans & freshens. Duo-cubes. In-tank. Automatic toilet cleaner. Up to 8 weeks (Each cube lasts up to 4 weeks). Blue water. Helps fight toilet ring, hard water & limescale stains. Safe for toilet components. Easy to use. Cleans + freshens. Questions or comments? Call 1-800-290-0158 or visit us at www.softscrub.com. Septic tank safe. Please recycle. Made in Poland.