over flow pipe

[Flasher Wrasse]

If i have a 1.5 inch bulkhead for my drain and Im getting about 1800gph out of my return. How much large does my stand pipe and durso have to be than my bh? I tried just using straight 1.5" stand pipe and durso but it cant keep up with the pump that way. Should I go with 2" pipe and durso? The 1.5" pipe can keep up with nothing on the top of it. Any suggestions?

[Flasher Wrasse]

bump

[newnano]

im no expert but maybe making the air hole on the durso a little bigger might allow more to flow

[PiNaPLeX]

http://reefcentral.com/calc/drain.php

This should help you calculate the size of the drain.

[REEFUR]

how high should you go on a overfloe pipe