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Old 09-28-2007, 04:30 PM   #1
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Overflow boxes and head calcs

I am finalizing the plans for my sump and I have a couple of questions about overflow boxes and my head calcs.

I am planning on using a CPR CS50 overflow box. This is rated at 300gph. Is this the max flow of does it mean that is siphons at a constant 300gph?

I plan on using 2 mag 5s for my return pumps. I figure that my head is about 7 48 for the tank and stand + 36 for 3 90deg bends in the return U tube that I plan to use. The mag is rated at 125gph at this head height, giving me a total flow of 250gph.

Is this all correct?

Thanks
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Old 09-28-2007, 04:41 PM   #2
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That is max flow.
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Old 09-28-2007, 08:24 PM   #3
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