Santeen, 32 OZ, Drain Opener, Concentrated Sulfuric Acid Formula, Liquefies Organic Materials Such As Paper, Cotton Cloth, Food, Sanitary Napkins, Orgainic Waste, Soap & Grease, Thaws Frozen Drains, Reduces Amount Of Heat Generated While Dissolving Clogs, Lower Heat Means Less Chance Of Fumes Or Injury, Safe For ABS, PVC & Cast Iron Pipes.