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Old 10-28-2010, 04:49 PM   #31
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Oh thanks yea That makes sense..another question is whats the difference between the continues overflow and the regular syphon kind?
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Old 10-28-2010, 10:45 PM   #32
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What do you mean? An overflow box works a little different than a built-in overflow or an overflow that you drill, but they will all do they same thing (let water pumped up from the sump drain back to the sump).
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Old 10-29-2010, 12:03 AM   #33
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well because i was looking into the eshobbs overflow 300 gph but they have two different types..there is a continuous siphon overflow and one that just says oveflow box.
https://www.petsolutions.com/CPR-Con...I46304581.aspx

https://www.petsolutions.com/Overflo...I89089014.aspx
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Old 10-29-2010, 02:11 AM   #34
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More then likely one has an anti-air lock so that you will alway have a siphon and the othr might get air locked and need the air purged out of it. in other words one would keep its siphon and the other would not.
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Old 10-29-2010, 08:26 AM   #35
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Yeah, that is the only big difference you will find is that some have a little air valve that hooks up to an aqualufter pump that keeps the siphon no matter what. I like the Eshopps and you could make it continuous by adding the valve and pump. I can't remember for sure but I think I heard the CPR ones can be noisy.
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Old 10-29-2010, 09:45 PM   #36
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oh i see...so in other words i can just have to add a valve to the u tube? or what do you mean that
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Old 10-29-2010, 10:15 PM   #37
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i have been told to drill my tank instead of using over flow box..can anyone tell me about drilling or does anyone have a link i can read about drilling..is there any advantages by drilling instead?
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Old 10-29-2010, 11:32 PM   #38
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I wouldn't drill unless you have experience and it is a brand new tank. Older tanks crack a lot easier, and even new tanks can crack pretty easily (especially if you are not used to drilling glass). I did it at the shop I was running and the thicker the glass the better. Thin glass cracked a lot easier.

I have an overflow box and had drilled tanks at the store. If I did it again I would probably still go with an overflow box. I think it looks great, is easier, is arguably safer (a bulkhead could leak and drain the tank down to that level).
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Old 11-01-2010, 09:26 AM   #39
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When I am building my sump should I only leave a small chamber or portion for my return pump.. Should it be only enough so that it wouldn't over flow my display tank?
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Old 11-01-2010, 02:57 PM   #40
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The overflow should allow enough flow to nto have to worry about the display flooding. The less water that the pump section will hold the more likely the pump is to start pulling air.
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