This happened to me too with mp10qd's...A clean with vinegar solved it, and it spun perfectly freely. I put it into the tank and two days later it pops right off. This has happened a dozen times between the two (less than 1 year old) powerheads. It has completly turned me off of ecotech stuff.
I should add that my powerheads never spun more than 40%...not even half the power that they're rated for and they fail within a year...garbage.
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"I never learned from a man who agreed with me" -Robert Heinlein
Current Tank Info: 40 Gallon with Herbie overflow, 29 gallon sump with Cheato, Ecotech MP10wQD, Kessil A360WE, AquaC EV120, BRS 2 Part Dosing
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