Rooto 32 oz. Drain Opener, the ultimate liquid sulphuric acid drain cleaner for clearing stubborn sink/floor drains, grease traps, and septic tanks. This professional strength sulfuric acid-based drain opener quickly and effectively clears stubborn clogs. It is safe for use in all types of drains, including PVC, metal, and plastic. The 32-ounce bottle is enough to treat up to 8 drains. Designed to dissolve grease/food residue, hair, soap, and paper.