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Old 01-19-2013, 10:02 PM   #1
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Help me understand??

I'm preparing to start my first 150gl custom build and I've done some blue prints but now I'm rethinking because I didn't realize (current tank 55gl not drilled) the tank I'm looking at will be drilled and have 2 overflows (only planned for one when this was all a thought) anyways I'm going to use a 40gl breeder for sump (I think still in debate) and I'm wondering about flow rates. How is this calculated? Is each tank different? Is there some sore of rule of thumb to go by? This will also effect the size of PVC I use too right?

The tank I have now I bought all set up so I didn't get to experience this before thanks in advance for any help!
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Old 01-19-2013, 10:17 PM   #2
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It's just gravity fed to the sump and pumped back up. A common diameter is 1" for drain and 3/4" return.
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Old 01-19-2013, 10:20 PM   #3
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It's just gravity fed to the sump and pumped back up. A common diameter is 1" for drain and 3/4" return.
Ok but what about flow rate? What is the average pump size (GPH) that should be put through a sump? Is each tank different because is determined by tank size?
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Old 01-19-2013, 10:43 PM   #4
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You want about 5-10x your tank size going through your sump per hour. And about 30x+ for the entire tank (with powerheads).
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Old 01-19-2013, 10:54 PM   #5
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You want about 5-10x your tank size going through your sump per hour. And about 30x+ for the entire tank (with powerheads).
This should also be Determined by what my skimmer can handle too right?
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Old 01-19-2013, 10:56 PM   #6
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You usually just want 5-10x. Doesn't really matter what the skimmer can take in. If more water is moving through the sump and the skimmer can't filter all of it it'll Just go back through another time.
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Old 01-19-2013, 11:10 PM   #7
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You usually just want 5-10x. Doesn't really matter what the skimmer can take in. If more water is moving through the sump and the skimmer can't filter all of it it'll Just go back through another time.
I was looking at mag drives, so would a 950gph return pump do me good? Or go a little higher?
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Old 01-19-2013, 11:15 PM   #8
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Way higher. Your going to have a bunch of headloss. I have a mag 18 on my 150.
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Old 01-19-2013, 11:21 PM   #9
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Way higher. Your going to have a bunch of headloss. I have a mag 18 on my 150.
Lol sorry what exactly is head loss? Travel distance? Sorry still learning
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Old 01-20-2013, 01:53 AM   #10
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Headloss is the gph lost over the length of the output. Say at your pump the output is 100gph. But if you have a pipe vertically 1 foot off the pump your gph falls to say 80gph (only loose example not real numbers) then you put a 90 degree elbow, then some pipe horizontally...all of that affects what the final out put is of the pump.
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