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Old 09-10-2012, 11:31 PM   #1
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Overflow and return pump.

Okay so I have a large sump, looks like its probably for about a 200 gallon.(pic)
And it looks like I'm ethier going to have to get two over flow boxes or one larger one.
I like the CPR over flow boxes, but it would be cheaper to get the larger one than two smaller ones.
The smallest large one that's has two bulkheads has a flow rate of 1200 gph, is that way over kill for a 100 gallon tank?
I would need a 1200 gph pump aswell for my return?
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Old 09-10-2012, 11:34 PM   #2
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What's the size tank and how about stock?

If its a 6' tank or longer I'd go with two
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Old 09-11-2012, 12:02 AM   #3
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100 gallon long. And it's not set up yet.
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Old 09-11-2012, 12:08 AM   #4
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I would go with two then one on each end. Will see what others have to say other then just me. I like to have more than one opinion when I post or start threads so I'm sure you do too
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Old 09-11-2012, 12:59 AM   #5
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Okay, I like lots of opinions.
It would probably be about the same price ether way.
I just don't know to go with tons of flow or less.
If I go with the larger one it would be 1200 gph.
If I go with two small ones it would be 600gph.
I will probably be stocking with lots of fish and coral.
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Old 09-11-2012, 04:17 AM   #6
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the overflows only draw down as much water as the return pump can supply, so I have to ask do have the return pump yet if so what is the flow rate at max and what is the flow rate with your tanks head height factored in
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Old 09-11-2012, 04:20 AM   #7
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I'd go bigger more flow has got to be better considering most people recommend 30 times that of your tank 600 gph just won't cut it
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Old 09-11-2012, 06:46 AM   #8
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The recommended flow rate thru a sump is 5-10x your tanks water volume. So for a 100g tank you are looking at anywhere from 500-1000gph. The 30x number is the amount of circulation in the tank and that's accomplished with powerheads.
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Old 09-11-2012, 08:14 PM   #9
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Here's the link to the boxes I was looking at.
http://www.marinedepot.com/ps_aquari...FUdvTAodBW0AyQ
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Old 09-11-2012, 08:15 PM   #10
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Quote:
Originally Posted by manbeast
the overflows only draw down as much water as the return pump can supply, so I have to ask do have the return pump yet if so what is the flow rate at max and what is the flow rate with your tanks head height factored in
These boxes say their gph?...
Explain please.
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