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Originally Posted by cowfish
I have a 1.25 inch hole for overflow
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is that the size of the hole in the glass or is that the size of bulkhead that will fit in the hole? if that is the hole in the glass then you might only beable to have a 3/4" bulkhead or 1" at best, which might be getting close to maxed out with a mag 9. like Titus said put a "T" on the out put of the pump so you can divert some of the flow directly back to the sump if you find the overflow can't keep up.
Also if you look at Wilty's math I can tell you a 1.25" hole will not flow anywhare near that in the real world. this is because the equasion has been way over simplified to the point whare it is wrong.
I have a flow calculator somewhare I will see if I can find it, but I think a 1" tube is rated at around 800 GPH.
Steve
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