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The Oatey Hercules Haymaker Tankless Water Heater Descaler Kit includes everything needed — solution, pump, hoses, and a bucket — to remove scale and maintain optimal performance of a tankless water heater. The solution quickly and easily dissolves inorganic deposits that restrict flow to restore circulation and heat transfer efficiency. The Haymaker solution dissolves three times the amount of scale as a gallon of white vinegar, without the foul odor. The solution is citric acid-based, non-corrosive, and VOC-free. Removing carbonates, sulfates, phosphates, rust, oxides, and other mineral deposits, Haymaker is compatible 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.