Liquid-Plumr® Full Clog Destroyer® 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, soap scum and gunk. It gets to work fast, eliminating stubborn blockages and leaving your drain free-flowing and clog-free. Full Clog Destroyer® is safe for all septic systems and pipes, including PVC, plastic, copper and old pipes. Keep your drains clear with Liquid-Plumr®.