Product Description Safe for all types of plumbing, Roebic K-77 Root Killer clears roots from pipes and stops new root growth. The fast-acting copper formula chemically kills roots that find their way into in a home's sewer line, which can cause costly backups. Roots are destroyed at the point of entry into pipes. Once killed, the dead root "seals off" the point of entry and the root cannot re-grow. Non-corrosive, K-77 works without harming surrounding trees, ground cover, or the natural bacteria content in septic tanks and cesspools. Roebic K-77 Root Killer is banned for use in septic systems in the state of Florida and Massachusetts due to state regulations, and is not for sale in Connecticut, the Bay counties of California, and the City of Golden in Jefferson County, CO. For over 50 years, Roebic has developed high quality products engineered for optimum performance, targeting specific problems and troublesome areas within the septic system. Trust Roebic, The Septic Professionals, for all your septic and drain care needs. From the Manufacturer K-77 clears existing roots from pipes. Roots are destroyed at the point of entry into pipes. Re-growth is prevented because unlike root cutting machines, K-77 chemically kills roots. Once killed, the dead root "seals off" the point of entry and the root cannot re-grow. Non-corrosive and safe for all types of plumbing. Will work without harming surrounding trees, ground cover or the natural bacteria content in septic tanks and cesspools. Not for sale in Connecticut, Massachusetts, the Bay counties of California and the City of Golden in Jefferson County, CO. Banned for use in Septic Systems in Florida.