I just moved to a house that supposedly has a backup sump pump that is backed by tap water. We’re currently in a power outage. I’ve never had a sump pump before.
How do I know it’s time to turn on the backup?
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Normally each pump has its own float switch . They are set to increasing water depths so each one comes on independently at successively higher water levels in the sump . So the first pump comes on at depth X. The second at X + 3", the third at X + 6" , etc. ( A neighbor had 4 pumps in his sump.).I suggest the final pump to switch on should be battery powered or ( I guess) a jet pump powered by water as you have. Must admit I have never seen a jet sump pump. In other words it seems to defeat the purpose of a "backup" pump if you have to be there to turn it on.