Environmentally friendly|Cleans toilets for three months|Easily installed in less than five minutes|Repels stains with every flush|8100PB Model|Isolates cleaner from the tank water so tank parts aren't damaged by the detergents or bleach used by other in-tank cleaners|Cleanser-treated water is injected only to the bowl, where it is needed, so cleaner application is efficient|Surfactant-based cleaning agent reduces spread of viruses and bacteria|Tray pack|Added bleach cleaning power