Hercules® Sludgehammer™ system restorer and noise reducer, 32 oz, composition: water, amino tri (methylene phosponic acid) pentasodium salt, poly (acrylic acid, sodium salt), lauramine oxide, 1.025 specific gravity, 212°F flash, 5 to 6. Hercules® Sludgehammer™ system restorer and noise reducer provides system cleaning and reduced kettling while restoring heating system efficiency. Oatey® Hercules® Sludgehammer™ 35298 System Restorer and Noise Reducer, 32 oz, 1.025