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Old 04-27-2012, 01:02 AM   #1
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How many GPH?

Okay I bought a sump which came with a couple pumps, one for the sump and one for the return, the one for the return is a CAP 1800 which pumps 628 GPH at 0 feet....what are they talking about with the whole feet thing? Is it the size of the tank or what?
http://www.reefs.org/library/pumps/pumps/cap1800.html
This is the site I am looking at
Thanks in advance!
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Old 04-27-2012, 01:38 AM   #2
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It means the height at which the return is at or "head" the higher it goes the more gravity to fight so lower the gph
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Old 04-27-2012, 09:10 AM   #3
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Ohh okay! So if the top of my tank, where the power head goes is 4 feet higher than the pump I would need to look at 4 feet?
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Old 04-27-2012, 09:22 AM   #4
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Correct
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