Heavy duty formula works on a variety of clogs. Ready-to-use, one-step solution. Safe on pipes. Liquid-Plumr full clog destroyer uses a specially formulated gel to eliminate the toughest clogs. Our thick, powerful gel won't dilute as it cuts through standing water to attack built-up hair, gunk, grease and soap scum. Safe for all septic systems and pipes, including PVC, plastic, copper and old pipes. Standing-water clogs. Precautions: keep out of reach of children. Injures eyes, skin and mucous membranes on contact. Harmful if swallowed. Avoid splashing. Do not use with ammonia, toilet bowl cleaners or non - Liquid-Plumr clog removers, as splashing or the release of hazardous gases may occur. Clean up any spillage immediately. First aid: eyes - flush immediately with water for 15 minutes. If wearing contact lenses, remove after first 5 minutes. Skin - wash immediately with water. If swallowed - drink a glassful of water. Do not induce vomiting. In all cases, call a doctor or poison control center immediately. Usage directions for Pour - slowly pour 1/5 of the bottle (2 cups) down the drain. For the toughest clogs, use 1/2 of the bottle. Wait - allow it to work for 15 minutes. In cases of standing water, wait until drain is clear. Rinse - flush with hot tap water. 80 fl oz Capacity.