Mak4 is plenty the Mak5 will push >1200gal hr and you'd need to really trust your overflows to allow that kind of flow.
Look at this page for some good pump data, it's the only one with stats on the mak4/5
http://www.reefs.org/library/pumps/
Jeff,
I use a Mak-4 for my return pump and IMO it's a lot of bang for the buck. I'm pumping 11' vertical and 14' horizontal and I think I'm STILL getting 900-1,000 gph at the display (1-1/2" pumbing on the return). I've been running the pump for a year now (without a cleaning) and it's never faulted.
It's a great pump as far as I'm concerned. The only drawback is that it's fairly noisey since it's fan cooled... but since it's in my basement it doesn't bother me. It's really not that bad, but I wouldn't want it in the display stand.
You're welcome to swing by and check it out if you want.
Steve
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