Hi Rachel,
Whats the condition of the impeller? Have you changed the impeller at all or is it still the original one?
I would suspect a worn/damaged impeller is causing your troubles. I have replaced the impeller once on both my Mag 9.5 and Mag 7 pumps, usually when the pumps get too noisy. Good idea to replace the impeller cover at the same time.
My pumps work like new after I put in the new impeller and cover.
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Cheers,
Andrew B.
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