The Clean Shot Liquid Acid Drain Opener is ideal for use in sinks, bathtubs, showers, and toilet bowls. The liquid acid drain opener is made of professional strength sulfuric acid for extra strength. This drain opener is also safe for septic and cesspool systems. Made of professional strength sulfuric acid Safe for septic and cesspool systems Do not use in stainless-steel sinks, garbage disposals, dishwashers, washing machines or if your home has metal pipes Do not use a plunger with drain opener Does not eat through roots Use in sinks, bathtubs, showers and toilet bowls