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Old 09-12-2011, 11:10 PM   #21
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That may be why you are not getting much flow out of it Take a look at this Diy pvc overflow
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Old 09-12-2011, 11:11 PM   #22
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I think you need a pipe turned back up to
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Old 09-12-2011, 11:19 PM   #23
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I think it's basically the same design. In yours you have the water falling down inside a small pipe and then it goes back up and over. Mine just falls down inside a larger overflow style "box" and goes up and over the tank. What is your return pump rated at? I would think mine would drain more than yours because you have 2 small pipes feeding 1 equal sized pipe over the back. I have to small pipes feeding a much larger pip on the back.
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Old 09-12-2011, 11:22 PM   #24
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My return pump is 1384 gallons a hour Im using inch and half pipe It actually increased the rate to add the second pipe that is turned up
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Old 09-12-2011, 11:23 PM   #25
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Interesting. Well let's see what the new pump does in a few days. My pump is doing probably a lot less that the 700 it says it's rated at
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Old 09-12-2011, 11:25 PM   #26
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I would say mine is doing less than that because that is a freshwater rating not a saltwater rating which tends to be a little less
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Old 09-12-2011, 11:27 PM   #27
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I did one out of .75 pvc in a freshwater using the same pump and the same method and made a spray bar like you have and had to take it off because it sounded like a shower running underneath my tank
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Old 09-12-2011, 11:35 PM   #28
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When the water level is a bit higher on the overflow teeth, the gurgling goes away. As for the sump portion, it's actually pretty quite but I have that homemade cover over it and an enclosed stand. I don't know... it's only been 3 days and this is my first "large" tank.

Honestly, I don't think I have a bad flow rate, I just thought it would be better. Even if it's running at 500gph, it's running 10x the tank volume or so. Thanks for helping out btw!
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Old 09-12-2011, 11:37 PM   #29
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No problem. That's why I put the screens on the one in my picture it made the overflow quiet
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Old 09-13-2011, 02:11 PM   #30
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Does anyone know what type of pump this guy has here with the airline tubing that is pulling air out of the check valves?

DIY PVC overflow - YouTube
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