Roebic K-77 Root Killer: Clears Pipes, Stops New Growth, Works for Sewer and Septic Systems - 32 OunceBrand: Roebic Features: Clears and stops new root growth in sewer and septic pipes, preventing clogs from tree and shrub roots for smooth flowing lines Copper formula kills roots at pipe entry points, prevents re growth, improves drainage, and flow for lasting pipe health Non corrosive, works for all plumbing. Won't harm trees, ground cover, or natural bacteria in septic tanks. Ideal for maintenance Easy to use, apply every 6 to 12 months for optimal