Cleans sluggish septic tanks, cesspools, drywells, and drain fields. Contains fast acting bacteria cultures that act quickly to restore operating efficiency. Should be applied to any septic tank or cesspool when sluggishness is first noticed. Allow 1 week for system to return to normalcy, then apply Roebic K37 or K47 to prevent future clogging. Use 1 quart for each 500 gallon capacity. 32 oz.