What type of materials does flushing help to remove from the water system?

Flushing in a water system is primarily aimed at improving water quality and removing sediments and contaminants that may accumulate over time. One of the key reasons for flushing is to eliminate chlorine-reducing materials, which can include those substances that may lead to the formation of disinfection byproducts or reduce the effectiveness of chlorination in the treatment process. Flushing helps maintain the desired residual chlorine levels, ensuring that water remains safe for consumption and effectively disinfected.

While other options such as iron materials, calcium minerals, and organic compounds can contribute to water quality issues and may also be addressed through flushing, the primary focus in the context of this question is on the removal of chlorine-reducing materials. These materials are critical to address because they can compromise water disinfecting protocols and overall safety, making their removal a priority in proper water system maintenance.