Appreciate everyone's response. Didn't realize it would be such a discussion! I have new ones in from a month ago and 4 new in package spares. My exec. decision for the next change is to put the oldest new ones in and buy a new set for spares. I will keep the ones taken out as the back up emergency spares. 6 impellers would seem to be more than enough but what do I know. Oh, throwing away the 5 sets of old old ones I inherited. Just not enough cost to justify keeping anything very old. These range in age from 3 years to....??? who knows...
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