ZAP Sulfuric Acid Drain Pipe Opener is a heavy-duty, sulfuric acid drain pipe opener formulated specifically for emergency use. Quickly clears clogged drains, waste lines, and thaws frozen lines. Disintegrates paper, rags, sanitary napkins, lime and scale deposits, food scraps and other organic matter. Melts grease quickly. Made with concentrated virgin sulfuric acid. Contains protective, corrosion inhibitors and quick penetrating activating agents. They inhibit corrosive action, and their proven protective superiority is attested by an independent laboratory. Will not harm septic tanks, cesspools, drainage fields, and leaching systems when properly used according to directions. Saves time and effort - and simplifies tough jobs. Emergency stoppages can be promptly eliminated in the shortest time - cleanly - without the use of mechanical equipment.