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Old 03-30-2014, 04:53 PM   #1
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How does an overflow work

I just bought a 128 gallon tank with a 50 gallon sump tank. It's drilled for an over flow. But I don't know how any of this works. What do I need? It came with two big powerheads... Click image for larger version

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Old 03-30-2014, 05:03 PM   #2
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How does an overflow work

Here read this article, and the 3 part one linked at the bottom (best reading on sumps I've read) and I doubt you'll have any more questions

http://reefkeeping.com/issues/2008-01/newbie/index.php
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Old 03-30-2014, 05:36 PM   #3
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You are going to need bulkheads, which will allow you to put pipes through those holes in the overflow without leaking.
You need to figure out what size bulkheads you need according to the hole sizes.

Then you will need to construct a standpipe (google "durso standpipe") to make it quiet.
Then you will hook one or both of those pumps to return(s) and you are ready to go.


The drain will go into one side of your sump and the return pump(s) will go in the other.
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Old 03-30-2014, 05:47 PM   #4
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Will those two pumps work? It's what he gave me. So I'm assuming that's what I need.... But I don't know what they are hah! One looks like a hose could attack to it.
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Old 03-30-2014, 07:24 PM   #5
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This may sound really stupid, but does the water just fall into the overflow? Like I just hook up the PVC piping and it just drains in?
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Old 03-30-2014, 08:01 PM   #6
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One looks like a return pump, and the other looks like it was used as flow inside the tank.
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Old 03-30-2014, 08:20 PM   #7
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Quote:
Originally Posted by chevypride View Post
This may sound really stupid, but does the water just fall into the overflow? Like I just hook up the PVC piping and it just drains in?
thats it once everything is setup the return pumps water up into the tank which forces water down the drain pipe into the sump thats basically the circle
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Old 03-30-2014, 08:30 PM   #8
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Does the aquarium actually have an overflow in it already? One of those powerheads is for circulation within the tank and the other is a return pump from the sump. The return pump returns water from the sump to the tank, the tank fills then overflows into the overflow weir and syphons down through a pipe back into the sump. If the power is cut the pump stops, the tank stope filling and the overflow into the weir stops, thus preventing a flood. Make sure your return nozzle (the water that is flowing back into y he tank) is above or at the water line, or make sur it has a hole drilled into it otherwise is your power is cut water WILL syphon down the return pipe and you will have a flood. Once you do some googling and research it'll all become clear (as mud lol)

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Old 03-30-2014, 08:32 PM   #9
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Oh and you will need a silencer for your weir overflow drain itll be crazy noisy. I recommend the diy stockman standpipe,better than the durso imo.

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Old 03-30-2014, 08:59 PM   #10
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Yes. It's already drilled. This all just seems so confusing to me hah. Luckily I have a few months of research while I hoard for supplies.
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