Perusal of some aquarium forums indicates the Mak4 is a pretty decent pump, but somewhat noisy, though the one I'm looking at is one of the smaller models. It's quieter than an Iwaki of comparable power but doesn't have the same reputation for quality. Blueline pumps however do look quite good, equal in performance to an Iwaki, but slightly quieter and definitely cheaper.
But I've come to the conclusion I can get similar performance for WAY less just by buying another Mag 3 and running it in series.
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