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Old 05-29-2011, 07:25 PM   #1
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Overflow/siphon system

Got a120 gal with 15 gal sump, having trouble with the overflow being too slow. It won't keep up with my pump. Need some design ideas.
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Old 05-29-2011, 07:38 PM   #2
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- Try letting more water into the overflow if possible (lowering it inside the tank)
- If there is a sponge (prefilter) in the overflow in the part outside of the tank try taking that out to get more flow.
- Add a second overflow
- Add a smaller pump

How many GPH is your pump rated?
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Old 05-29-2011, 07:45 PM   #3
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Can you post a pic of your overflow?
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Old 05-29-2011, 08:13 PM   #4
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Don't wanna lower the pipe, that could overflow my sump if I lose the pump for some reason. Im using two 1 inch PVC pipes, each has 1/2 inch nylon tubing for the siphons. Both drain to a single overflow with a 3/4 in drain down to the sump.
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Old 05-29-2011, 08:17 PM   #5
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Pump is rated between 400 and 800 gph. It's adjustable.
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Old 05-29-2011, 09:51 PM   #6
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I'll get a pic up in a few days. Outa town right now.
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Old 05-29-2011, 09:59 PM   #7
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Here is one I built myself from pvc Diy pvc overflow
It keeps up with my pump that is 1384 gph
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Old 05-29-2011, 10:44 PM   #8
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So how does the water enter your sump? Does the 1 1/2 in line extend below the water line of your sump? Also, explain to me the siphon break.
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Old 05-29-2011, 10:55 PM   #9
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It flows as a siphon over the back of my tank to the sump which is underneath my dt and I just run it into the top of the sump A siphon break is usually a small hole drilled just below the water line of the tank(mine is in my return) which will allow air in if you have a power outage or pump failure breaking the siphon and keeping it from draining the water all the way down to your return
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Old 05-29-2011, 11:02 PM   #10
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Don't you want to keep the siphon primed for when the pump comes back on? Otherwise you could over flow the tank.
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