Which chemical can be added to water systems to help sequester iron and manganese?

Polyphosphates are effective for sequestering iron and manganese in water systems. They work by forming stable complexes with these metal ions, which prevents them from precipitating and forming deposits in pipes or water treatment facilities. This sequestering capability is critical because unsequestered iron and manganese can lead to discoloration of the water, potential clogging of pipes, and aesthetic issues in terms of stains on fixtures and laundry.

Unlike other options, polyphosphates maintain a soluble state for these metals, effectively reducing operational challenges in water distribution systems. The ability of polyphosphates to act as a treatment for metals aligns them with the goals of maintaining water quality and system efficiency.