Clears roots from pipes and stops new growth. Keeps lines free from clogging tree and shrub roots. Roots have a fantastic ability to seek out small openings in pipelines in search of water. Once a pipe is penetrated, rapid growth in the pipe causes blockage. This formula is proven by years of success in clearing sewers and drains of root growth, etc. Fast and easy-to-use. Harmless to bacteria in septic tanks and cesspools. Guaranteed to prevent root blockage for a full year. 2 lb. bottle.