K77 DRAIN ROOT KILLER 32OZ. | K-77 root killer destroys clogging tree and shrub roots from pipes fast. When roots invade sewer pipes and clog septic system drain fields, ROEBIC's fast acting root killing formulas are needed. K-77 root killer clears roots from leach fields, improving drainage and flow. This can prevent standing water and soggy conditions from developing over a leach field.