ComStar® Pure Lye® is an industrial-strength, powerful tool to clear out drains, grease traps, septic systems and roots. This formula is the purest white, bead-size lye (sodium hydroxide) in the world, 99% pure. A natural drain opener, Pure Lye® is bio-degradable, odorless and non-acidic, safe on fine fixtures, chrome trim and metal or plastic pipes. This amazing product clears out clogged and slow-moving drains, grease traps and septic systems, without harming septic tanks or cesspools. Because of the unique bead shape, ComStar® Pure Lye® will sink to the bottom of standing water and attack the cause of the blockage for a fast break-up. ComStar® Pure Lye® does not stink or create fumes and has become a favorite drain-opening product for homes, schools, hospitals, cafeterias, commercial buildings and restaurants.