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Old 06-17-2014, 07:54 PM   #51
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The cpr siphon chamber is rounded enough at the corners that it "shouldn't" matter provided you have enough flow.
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Old 06-17-2014, 08:12 PM   #52
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I have no overflow box yet and I find this discussion both informative and entertaining.

This debate can be put to rest easily if Dav3 can video clip his bubble clearing unit on YouTube for all the doubters, novices (like me), and future generations to admire.
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Old 06-17-2014, 08:23 PM   #53
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Quote:
Originally Posted by mattcham View Post
I have no overflow box yet and I find this discussion both informative and entertaining. This debate can be put to rest easily if Dav3 can video clip his bubble clearing unit on YouTube for all the doubters, novices, and future generations to admire.
The tube is too dark and bubbles passing through too small to see anything important in a video.
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Old 06-17-2014, 09:48 PM   #54
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I would say that Dav3 is in no position to claim that the CPR would work just like the U-tube overflow because he never had a CPR while I had it for almost 2 years. Here is something to think about. I would agree that the circular shaped overflow has advantage with the rectangular overflow due to the fact that the water flows easily in the perimeter inside the tube thus bubbles can be forced through the other side. While the corners in a rectangular shaped overflow chamber of a CPR creates turbulence and trap the bubbles on both front and rear at the top until they occupy the top area and builds up. You can raise the DT level to increase the flow but it will not help and will not flush that trapped air.
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Old 06-19-2014, 12:20 PM   #55
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As the OP's question has been answered, thread closed as it has broken down to two separate variations of HOB overflow, both of which work depending on what you prefer.
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