Blue crystal disinfecting tablets are a special microbiocide developed exclusively for use in residential wastewater treatment applications. Designed for positive disinfection during low, sustained, variable and intermittent flow rates that are common to residential systems, the potent blue crystal formulation reduces 99% of bacteria within the first 10 mins of contact. Blue crystal tablets are a preferred, safe alternative to dangerous liquid and gas disinfection systems. Maintaining a consistent chemical application rate at intermittent peak flow factors as high as four, blue crystal tablets provide reliable effluent disinfection even when the significant runoff period is 6 hrs. When used as directed in any approved, gravity flow chlorinator, blue crystal tablets allow residential treatment systems to meet regulatory disinfection requirements with a product that is inexpensive, safe and easy to use.