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Hercules Haymaker Tankless Water Heater Descaler quickly and easily dissolves inorganic deposits that restrict flow to restore circulation and heat transfer efficiency. Citric acid-based non-corrosive and VOC-free. Removes carbonates sulfates phosphates rust oxides and other mineral deposits. Compatabile with most commonly found plumbing-related materials including PVC CPVC ABS rubber steel and most metals. Other applications include descaling non-aluminum heat exchangers and water heaters. Extends the life of the appliance when used as part of a regularly scheduled preventative maintenance program. Safe for septic systems and sewers.