Sump Pump Sucking air

I recently installed a battery backup sump pump. Now there are 2 pumps in
the pit, the primary electric pump and the battery backup pump that only
kicks in if there is a failure of the power or the primary pump.
The new pump sitting in the pit, displaces enough water that when the
primary pump kicks in like normal, it runs out of water before it is done
cycling, and starts sucking air. Is this harmful to the primary pump?
I have considered raising the secondary pump so that there is more room for
the primary pump, is this necessary?
Reply to
The battery powered pump shouldn't come on unless the power is off. The primary pump should never keep running if there's no water in the pit. Raise the battery pump, and figure out why the primary pump isn't shutting off.
Reply to
Mike Grooms
Dont you have a float to make the pump come on? I put a float for pump and one for alarm. The alarm float is a little bit higher. Put your battery powered pumps float a little bit higher than the primary pumps float. The power goes from battery through float switch to pump. This way the pump comes on if there is power or not. If you primary pump dies and the water level goes up the battery pump kicks in to save the day. I would also have a light or alarm come on when this happens. Obviously this all goes on battery. I dont use bilge pumps with built in floats.
Reply to
Ned Flanders

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