Slow dissolving tablet leaves no residue and does not lower effluent pH. Provides continuous chlorine residual that aids in killing harmful bacteria and controlling algae. Eliminates unpredictable flow rates and creates an ideal bacterial environment within a matter of minutes. Controls slime in waste water effluents and filter beds. Use in aerobic septic systems, sewage, and waste water treatment systems. Calcium hypochlorite tablets begin working in 15 minutes. EPA approved for sewage and wastewater applications. 65% available chlorine.