The Basement Watchdog Big 1/2 HP Combination Sump Pump System is designed to provide both primary and battery-backup pump capabilities. The primary system pumps 4,400 GPH at 0 ft. of lift and 3,200 GPH at 10 ft. of lift, and the backup system pumps 2,500 GPH at 0 ft. of lift and 1,730 GPH at 10 ft. of lift. The primary pump will operate a...