Each tablet lasts up to 4 weeks. Continuous clean. Helps keep your toilet bowl stain free. 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). Won't harm plumbing or septic systems. Facts You Can Feel About: Contains no phosphates. A family company since 1886. - Fisk Johnson. Facts You Can Feel About: Product not tested on animals.