What is the filtration flow rate through a high-rate mixed media filter?

• A. 1-3 gpm/ft²
• B. 2-5 gpm/ft²
• C. 3-8 gpm/ft²
• D. 4-10 gpm/ft²

Answer: (C)

The filtration flow rate through a high-rate mixed media filter typically ranges from 3 to 8 gallons per minute per square foot (gpm/ft²). This flow rate indicates the efficiency and capacity of the filter to remove particles from water as it passes through the media. High-rate filters are designed to handle larger volumes of water compared to conventional filters, which allows for quicker processing while still achieving effective filtration.

This range reflects the design and operational parameters of high-rate filters, which utilize multiple layers of different media to maximize surface area and improve contaminant removal. The flow rates also accommodate various types of water treatment applications, ensuring that the filter remains effective without becoming overloaded or compromising water quality. Understanding this flow rate is essential for water treatment operators to select appropriate equipment and maintain optimal performance in the filtration process.