A 3 pump sump pit system
Two AC powered pumps with one set higher than the other and a DC pump set above those two should the power go off. The DC pump won't last forever but it may last for a few hours. At the time I shot this video, the lower primary pump had stopped working and the secondary or back up AC pump had been doing the job of pumping the water out of the pit. I replaced the non working pump and left the house with 2 good AC pumps.
