giving up the ghost
The problem with running an impeller until it "gives up the ghost" is that it might also be inclined to give up some of its body parts and scatter them amongst the area it used to love, your engine. An amputated impeller blade can block an artery almost anywhere in the system. The problem with the flexible impeller is that it will weaken over time even if used regularly. This is especially true in salt water. Still, there will always be reports from mariners who have used an impeller for many years without incident. So as they say out there in California; "you have to ask yourself one question, do you feel lucky?"
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