I have a pair of mark II's where one has died and the other makes such a racket as to be unusable. My system is neiter restrictive (1/2" ID) nor am i running the pumps in series. There is no corrosion in my water, and the only thing i can conclude is that they BOTH have succumbed to manufacturer defect. Where can i send these back to "upgrade" to this new series?
As i paid good money for each of these pumps, i do hope that i will not be expected to pay a fee to have a warranty issue replaced.
Thank You.
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