Specially formulated concentrate for septic tank and cesspool owners. Ordinary drainpipe cleaners contain caustics (lye) that are dangerous to use and kill bacteria necessary in septic tanks and cesspools. This special bacteria-enzyme formula acts fast to prevent traps and drainpipes from clogging. Treat sinks, tubs, and showers monthly to assure freedom from clogging. Can be used in garbage disposals. A year's supply in each package. 16 oz. bag.