Krystal™ ABC Automatic Bowl Cleaner

This in-tank toilet bowl cleaner not only helps keep the toilet clean by preventing scale and mildew buildup-it also deodorizes in the process. The water is colored blue with each flush and contains a 22% surfactant formulation. Plus, the cleaner is nonpolluting, nontoxic and nonstaining, so you don't have to feel guilty about using it. Each cleaner is capable of lasting up to 30 days.