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Old 04-27-2006, 01:33 PM   #1
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Overflow Box Types

Is there a greater benefit with continuous overflows (like CPR) versus the tube siphon overflows?

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Old 04-27-2006, 04:16 PM   #2
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I have never owned one myself, but I've always been suspicious that the CPR style overflows with the square corners would trap air bubbles more easily than a U-tube overflow. In addition, if you needed to increase the amount of flow through a U-tube overflow you can simply make the drain bigger and add a second U-Tube. You don't have the option of adding another U-tube with the CPR style overflows.


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Old 04-27-2006, 04:45 PM   #3
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U-tubes ....much safer. They don't rely on a PH to keep the the siphon going.
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flow, overflow, overflow box

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