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What's needed is a way to measure how much water the pump is pumping, this is ultimately all that matters. If it pumps out a 5 gallon bucket in 10 seconds with a brand new impeller, you can re-measure it each year and if it takes, say 20 seconds, change the impeller. You'd have to have a 'Y' set up on your water intake hose, though, and the only ones I've seen are those plastic things that I would not put on my boat. I don't want a plastic Y connector breaking in the middle of the lake and sinking my boat.
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