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Old 05-27-2009, 03:41 PM   #1
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sump return questions

My question is somewhat related to starting a new tank with sump. In case of a power outage and the power comes back, won't the main tank overflow when the return pump kicks in? This takes into account a HOB overflow, not a built-in of course. How would someone avoid this catastrophic event?
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Old 05-27-2009, 05:11 PM   #2
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No, the main tank would be fine. It's the sump you have to worry about.
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Old 05-27-2009, 05:48 PM   #3
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Your main tank will back flow till it reaches the overflow line. As mentioned above you need to make sure you have space for the backflow or drill a little hole in the return nozzle to break the siphon. I have room in my refuge/sump so I dont need the hole to break the siphon.
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Old 05-27-2009, 05:57 PM   #4
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Not sure if I'm phrasing it properly. I am under the impression that when using a HOB overflow box, the siphon is broken when power cuts off and water back flows into the sump via the return outlet.

The actual question is:
When the power comes back on and the return pump starts filling the main tank again, will water OVER flow from the main tank since the initial siphon in the HOB overflow box is lost?

I'm considering getting the CPR overflow box, but can't get my logic working. This will only work if the siphon is never broken when power is lost. That way, when the return pump starts filling the tank, the gradient is restored and no overflow occurs.

Maybe I should just invest in a tank with a drilled overflow...grr...
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Old 05-27-2009, 06:30 PM   #5
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For seven years when I had my 55 I had a HOB overflow and no even when the power is out and the backlow returns to the sump the siphon is not broken. The HOB has a little well in the back part keeping air from getting in your J tube and as long as air does not get in there you`ll still have the siphon or vacuum. JME
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Old 05-27-2009, 06:40 PM   #6
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That helps, but I think the CPR doesn't use a tube. Do the principles of the tube follow? This is the link to the one I'm contemplating purchasing.

CPR Overflow Box
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Old 05-27-2009, 06:48 PM   #7
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Yes that one is a little different. Maybe someone with some experience can share.
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Old 05-27-2009, 06:49 PM   #8
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Reef Aquarium Filtration: Eshopps Overflow Boxes

This is the one I was using
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Old 05-27-2009, 07:11 PM   #9
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yea i use the same one as melosu58 did and it has worked great plus its not to expensive i have not had any problem out of it at all and there as been a few power faliures it just starts flowing again once power is restored
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Old 05-27-2009, 09:13 PM   #10
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Well, if you guys have had good experience with it, I'll pick that up instead. I'll probably run a Mag 5. At around 4 feet, it should give me the 300 GPH to prevent overflow. Do you guys also just use clear vinyl tubing (and what size)? Do I need a diverter valve?

Thanks for all the help by the way. Been wanting to do this for awhile, but never an opportune time.
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