Diy pvc overflow

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Can anybody tell me what size pvc I should use to flow at least 600 gph from a siphon overflow?
3/4inch. i just built mine a few months ago. a tip from someone who learned the hard way... use cutoff ball valves to adjust the flow down the siphon with the pump output. i had to pipe a relief line back into my sump from the pump return to cut back the flow a bit because the 600 gph was blowing all my corals around. if needed i can take pics and provide a diagram of mine to work with. its works pretty well. i love how every tank is unique when it comes to setup:p
 
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