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Originally Posted by Arivaldo
In case of these Aquarium Mag pumps (eheim, maxijet, resun, via aqua, hydor), which use magnetic rotor (instead of iron build), the spin is "crazy". That is the reason of many starting noise, like "clicks" inside volute.
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For what reason? They essentially spin a magnetic field which pulls the impellor round since it has attached magnets. That's not particularly crazy... It's not dissimilar to how a brushless fan works.