I'm puzzled though. How come on paper and in synthetic tests, the pumps appear to push more flow than the Eheim 1048, yet when put onto an actual cooling loop they're struggling to push as much flow, even in series of parallel than the Eheim 1048? Did I miss something? Do the pumps have a bizzare PQ curve or something?
I would never buy an aluminium pump though - even if it was anodized - that's just me. All that swirling motion with the impeller means that any grit particles of any kind get flung with the most force when inside a pump, and it will eventually wear away the anodising. May be able to get away with it if Type 3 hard anodising was used (not colored).
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