What is the flow rate for high rate sand filters?

High rate sand filters are designed to operate at a flow rate that allows for efficient filtration of water while minimizing backwashing frequency and maintaining operational effectiveness. The correct range for high rate sand filters is between 5 to 20 gallons per minute per square foot (gpm/ft²). This flow rate ensures that the sand bed is sufficiently effective at capturing particles without leading to excessive head loss or clogging.

When operating within this flow range, the filter can adequately remove suspended solids and impurities from the water while keeping the filtration process efficient. Filters that operate outside this range may experience issues, such as reduced filtration quality or increased maintenance requirements. Therefore, the identified flow rate for high rate sand filters is optimal for both performance and longevity.