Roebic's 32 oz. Main Line Sewer/Septic Cleaner is a powerful concentrated bacterial waste degrading product designed for any sewer line. It effectively clears fats, grease, sludge, and paper, preventing clogging problems and back-ups. Suitable for any household, whether using a septic system or sewer, this cleaner attacks accumulated organic material, restoring proper flow and keeping your lines problem-free.