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Hello, my name is***** will assist you.
For the impeller, yes it is normal for them to wear. they should be replaced every two years.
One thing that I have seen on this motor is that water a winter with a hard freeze and the motor was trimmed up, there could have been water trapped around the water tube and it froze, thus crushing the tube. you will still see a decent flow of water, but it is not enough to cool the motor at higher RPMs. Hopefully that is not the case with yours and it is just an impeller.
Any questions, please feel to reply to me.