The AC pump in the Basement Watchdog Combo (Model CITE-33) moves 3,720 GPH at 0-foot lift and 3,100 GPH at 10 feet, and the battery backup pumps 2,000 GPH at 0-foot lift and 1,000 GPH at 10 feet. Plus, both the primary and backup can run simultaneously, providing extra capacity if the primary pump is overwhelmed by the volume of water in extreme rainstorms.