Hercules Haymaker 32 Oz. Ready To Use Tankless Water Heater Descaler is a powerful and non-corrosive solution specially formulated to restore flow and efficiency in your water heating system. Made with citric acid, this VOC- liquid effectively dissolves mineral deposits such as carbonates, sulfates, phosphates, rust, and oxides that can hinder your heater’s performance. It is safe for use with a wide range of plumbing materials including PVC, CPVC, ABS, rubber, steel, and other common metals, making it i for tankless water heaters and non-aluminum heat exchangers. Additionally, this descaler is safe for potable water systems, septic systems, and sewers, making it a vital component of any preventative maintenance routine. Model Number: 35230