What is the recommended capacity of the pump for a recirculating SF?

The recommended capacity of the pump for a recirculating Subsurface Flow (SF) system generally falls within the range of 15-25 gallons per minute (gpm) at a total dynamic head (TDH) of 10 feet. This capacity is essential for ensuring proper circulation and treatment of wastewater in such systems.

A pump operating within this range is deemed effective for maintaining optimal flow rates, which is critical for preventing issues such as hydraulic overload and ensuring sufficient processing of the wastewater through the system. The 15-25 gpm range allows for adequate distribution of effluent across the recirculating media, thereby enhancing the treatment effectiveness.

The significance of this specific range also ties into system design metrics, as it aligns with the treatment standards and operational reliability for recirculating SF systems commonly implemented in Illinois and similar regions. Ensuring that the pump is not under or over-capacity is key to the longevity and efficiency of the system.