Have gould j10s jet pump, that is not putting out much volume and taking a long time to reach shut off pressure, is it most likely time for a new impeller?

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is it most likely time for a new impelle

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Only a pump guy can tell you that and only after he opens up the pump.
There are other things besides a bad impeller that could cause your problem but until you open up the pump you'll never know. Good luck, Tom