Figuring Overflow Gph Capacity

[JustAHobbiest]

so for pods you don't recommend sand in sump? was told at least a couple inches of sand in fuge really helps grow pods and good place to catch detritus so a clean up crew as well in fuge. Please keep the info coming rather figure it out now then in middle of build

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[jkapit]

I have a beautiful Oceanic 180g Bowfront. Plan on starting a build thread here in the future. It has been in my basement for about a 18 months. As everyone starts out, I'm kinda new to saltwater and currently in cram mode as far as info. Iv been researching everything Reef related. I can't find anywhere a formula to calculate Gph for overflows I have two overflows in either end of tank. Thanks in advance.

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I have the same tank, I use 1 1/4" stand pipes, which feed a 1" pipe taking the water into the basement. I push about 900-1000gph back up to the tank with two Iwaki 55RLT return pumps. I have a lot of head pressure(about 30 ft with 3/4" pipe and quit a few 90 degree angles) so I went with two pumps to move that much water. When I had the pump in the stand, I only needed a single Iwaki 55RLT.

Conservative estimates for bulkhead flow rates are as follows:

3/4 inch - 350 gallons per hour per bulkhead (unconfirmed) (1325 liters per hour).
1 inch - 600 gallons per hour per bulkhead (2275 liters per hour).
1.5 inch - 1,500 gallons per hour per bulkhead (5675 liters per hour),

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