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 ten minutes 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 six hours. 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. Blue Crystal disinfecting tablets are packaged in easy to open, resealable 1.9 lb., 10 lb. and 100 lb. Department of Transportation approved containers Blue Crystal® Residential Disinfecting Tablets eliminate 99% of bacteria within the first 10 minutes of contact The low, intermittent and surge flows typical of a residential treatment plant are a challenge to any disinfection system. Only Norweco Blue Crystal tablets are formulated for these demanding flow conditions. Containing 73% calcium hypochlorite and proprietary inert compounds, Blue Crystal tablets provide an elevated chlorine dose which insures complete disinfection yet does not damage lawns or landscaping. Easy to use with any brand of residential treatment systems, Blue Crystal tablets are listed for use under ANSI/NSF Standard 46 and registered with the USEPA and all fifty State Departments of Agriculture. They are available in 10 and 100 lb. DOT approved and child resistant packages.