What is the maximum head loss recommended for a rapid sand filter?

The correct answer of 8 feet for the maximum head loss recommended for a rapid sand filter aligns with typical operational guidelines for this type of water treatment system. Rapid sand filters are designed to remove particulates from water through sedimentation and filtration processes, and managing head loss is crucial for maintaining efficient operation.

Head loss is an important metric as it indicates the pressure drop across the filter media caused by the accumulation of particles and buildup of contaminants. If the head loss exceeds recommended levels, it could signal the need for backwashing or maintenance to clear the filter media, allowing for optimal water flow and treatment effectiveness.

A maximum head loss of 8 feet is typically accepted in the industry, as it provides a balance between effective filtration and operational performance. Once the head loss reaches this threshold, operators are advised to perform maintenance actions, such as backwashing, to restore the filter’s efficiency and ensure a consistent water supply.

Other options reflect lower thresholds, which may not allow for sufficient operational flexibility. Operating with head losses below this standard could lead to premature and excessive backwashing, while exceeding it could compromise water quality and system reliability. This is why 8 feet stands out as an appropriate maximum for effective filter operation.