Like backup pumps, if the primary pump malfunctions or a power failure occurs, the backup pump will automatically activate. Sewage Sump Pumps Sump pumps are also used for sewage and septic systems.

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An emergency sump pump is a back-up sump pump for emergency use during pump failure or power failure for ... consistently achieving 20psi pressure or more. Water powered emergency pumps work ...

Some sump pump backup systems, though, are water-powered. They use the pressure from your home’s municipal water line to drive the system, much like a water wheel.