HAYMAKER DESCALER KIT 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.