Cleans sluggish septic tanks, cesspools and drywells. Contains fast acting bacteria cul- tures that act quickly to restore operating efficiency. Apply to any septic tank or cesspool. Allow one week for system to return to normal and then apply Roebic K-37 or K-47 to prevent week for system to return to normal, and future clogging. Use 1 quart (.947 L) for each 500-gallon (1895 L) capacity.