Here is my water powered backup sump pump setup using a Liberty Pumps Sump Jet SJ10. I chose this setup after spending a night bailing water to save a family members basement. They had a battery powered backup pump which lasted about 45min after the power failed and the power remained off for several hours. The water powered pump should continue to work as long as you have water pressure.

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Link to pump: http://www.libertypumps.com/Products/...