running on a skimmer, the mak4 is loud. Just running as a return, its a great pump.
the head loss from the mag pumps is pretty significant. I forget where I saw the chart, but someone had put together a chart of a bunch of popular pumps and their flow characteristics. Probably was on RC or RDO.
Do you already have the sea swirl? if not, have you considered the oceansmotions.com product? I have the heavy duty 4 way unit and its put together sooo simply I dont think it can ever break down.
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