The Basement Watchdog Big Combo CONNECT (Model CITS-50), our most popular option, moves an impressive 4,400 GPH at 0-foot lift and 3,540 GPH at 10-foot height from the primary AC sump pump. The battery backup sump pump moves 2,600 GPH at 0-foot lift and 1,850 GPH at 10-foot lift. 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.