CARUS™ 8500 a unique poly-orthophosphate designed to provide effective corrosion control and sequestration in potable and industrial water systems. CARUS™ 8500 water treatment chemical is an effective corrosion inhibitor and sequestrant for use in potable and industrial water systems. The product is a liquid concentrate of exceptional purity, clarity, and stability utilizing a broad spectrum of phosphates for better sequestering and corrosion control.