It is not advisable to use tank additives such as tablets or discs to clean a toilet. These products may seem convenient, as they dissolve in the tank and spread disinfectant with each flush. However, James Walsh, vice president of product management for American Standard, advises against using them as they can damage the toilet’s components and void the warranty. These tablets turn the standing water in the tank into a corrosive liquid, which can harm the flushing mechanism over time, leading to leaks and potential malfunctions.