Liquid-Plumr Pro Drain Cleaner is a powerful drain cleaner that is specially formulated to take on the toughest clogs. The thick gel holds together to cut through standing water and attack built-up hair, gunk and soap scum. It gets to work fast, eliminating stubborn blockages and leaves your drain free-flowing and clog-free. It is safe for all garbage disposals, septic systems and pipes, including PVC, plastic, copper and old pipes.