Repels tough hard water & limescale stains. A family company. Helps keep your toilet bowl stain free for up to 20 weeks (However, it is not recommended that pets regularly drink water from the toilet) (Each disc lasts up to 4 weeks). Stain repel. Cleans and deodorizes with every flush. Helps keep your toilet bowl stain free. Bowl water not harmful to children or pets (However, it is not recommended that pets regularly drink water from the toilet) (Each disc lasts up to 4 weeks). Won't harm plumbing or septic systems. Facts you can feel good about. Product not tested on animals. Clean toilet bowl thoroughly, including under the rim. A family company since 1886. - Fish Johnson. Contains no phosphates. Learn More at: www.scjohnson.com. Visit us at www.vanish.com. Questions? Comments? Call 800-558-5252 or write Helen Johnson. Made in Mexico.