I use a 1.5" overflow and I can barly flow 1100 gph through it. now I have two 90 degree bends in it so that will be a bit of a factor. but I would guess you would be ok if you are fairly strait. I think the "book" max flow for free falling water through a 1.5" pvc pipe is about 1700 to 1800 gph but i would have to find my book to be sure.
Steve
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