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.