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Concentrated 93% inhibited virgin sulfuric acid liquid drain opener. Quickly dissolves the toughest organic clogs, including paper, rags, hair, sanitary products, and food. The heat generated in the dissolving of blockages acts to melt away grease, soap, and oils. For use in sinks, toilets, tubs and showers. Use only in PVC pipes. Safe for use in drains connected to septic systems when used in quantities as directed on the label.