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kev311

What size overflow?

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Hi all, just wondering if any of you could give me any suggestions on what size overflow i should use on my 40 gallon? I have a rio 1700 i was plannig on using for a return pump.

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^^^ What he said. You will need to get an idea of how much flow you have at the return into the tank. For instanc emy little giant pumps 650 GPH at 0 head height but drops to about 520 GPH when pumping it up to the tank. Check this link first to figure the flow at your head height: http://www.reefcentral.com/calc/hlc2.php

 

Based on what I could see I would run two 1" drains just for the extra insurance. (One primary and one backup drain with either being abloe to handle the entire flow)

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