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?
Thanks
cjcoates