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Old 01-08-2012, 12:39 AM   #1
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return pump help

So I am looking into buying a 120 gal tank and have decided to go with a sump but don't know a whole lot about them or return pumps. I heard you need to flow 10x your water volume? Is this true and if so can anyone make any good suggestions on a pump I should look into. Thanks
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Old 01-08-2012, 10:07 AM   #2
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The return pump size will be dictated by the amount the overflow can handle. You go from there....
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Old 01-08-2012, 11:10 AM   #3
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What is the normal size for 120 gal? I was thinking 900 maybe 1000
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Old 01-08-2012, 12:01 PM   #4
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Are you going to do a glass-holes type kit, or an internal overflow? If you go glass-holes, I'd get their 1500gph kit, and do something around 1000-1200gph after headloss is calculated.
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Old 01-08-2012, 12:07 PM   #5
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I was going to get an overflow box rated at 1200 gph but I know with head loss I will need a larger pump to turn that over. How do I calculate head loss? I know with a lot of pumps they tell the max head but other than that I have no clue
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Old 01-08-2012, 12:11 PM   #6
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This is a great tool - Head Loss Calculator

Just remember that you want a little wiggle room with your overflow. Make sure you have one that can handle more than your return pump, or dial back the return with a ball valve.
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Old 01-08-2012, 06:56 PM   #7
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That link you sent doesn't work... is it the one I found on reefcentral? The only issue I found with that is that It obviously doesn't have every pump out there and some of them aren't made anymore. Is there a formula to figure this out?
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Old 01-08-2012, 07:00 PM   #8
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I fixed the link. Yeah, it's the RC calculator. They don't have every pump made, but they've got a lot listed. Honestly, unless you with with some off the wall brand, they'll most likely have it on there. I'm not sure what kind of formula they're using to calculate it, but I'd imagine it's pretty complex.
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Old 01-08-2012, 07:29 PM   #9
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FYI your overflow only overflows what your pump is dialed in at. The 1500 gph just means max throughput. You don't need a 1500 gph pump.
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Old 01-08-2012, 08:13 PM   #10
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Got ya but with head loss I could very well need a 1500 gph pump correct? I want to turn the tank over 10x per hour due to it being a reef. Atleast that's what I have read. Is that correct?
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