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Old 06-10-2014, 07:34 PM   #1
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Overflow box questions

I am planning to get an overflow box to use a sump filter on my 120 gallon tank which has no holes.

Reading Amazon.com reviews for overflow boxes, I have a couple concerns:

1. Will the setup result in a flood if the power goes out for 5 minutes?

2. Will the filter resume normally without human intervention when the power comes back on after a 5 minute power outage?

3. Anyone have recommendations for overflow box brands/models that would address the above two concerns? My budget is $300 just for the overflow box. I don't want to drill holes into the aquarium.
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Old 06-10-2014, 07:40 PM   #2
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I use the CPR overflow with a siphon pump on my 120 gal. Had the power go out twice and the sump caught the over flow of water from having no power and when it came back on it worked itself out and put the water back into the tank
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Old 06-10-2014, 07:46 PM   #3
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I don't have a ton of experience with HOB overflows, but the little I have leans me towards CPR boxes as well. I like the aqualifter pump as my assurance the siphon will restart again after a power outage. BTW, those aqualifter pumps wear out and should be changed every year or so.
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Old 06-10-2014, 08:02 PM   #4
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Aqua lifter pump is unnecessary if you match return pump to overflow appropriately. Unless you just want piece of mind. But as X said those pumps can fail too.
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Old 06-10-2014, 08:09 PM   #5
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Yes you do need the pump with the CPR overflow. It's the only way to keep the siphon. unless there is another way to keep the siphon that somebody knows about.
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Old 06-10-2014, 08:40 PM   #6
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Quote:
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Yes you do need the pump with the CPR overflow. It's the only way to keep the siphon. unless there is another way to keep the siphon that somebody knows about.
As I said. Correctly match the return pump to the overflow. Need to calculate flow of return line after headloss. If the flow entering siphon is too low then bubbles get trapped and don't get flushed out of the siphon tube. The build up of bubbles is what breaks siphon. Over size the pump then dial it back with a ball or gate valve.
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Old 06-10-2014, 08:46 PM   #7
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This is what you need. At the drop down nav pick CS150 for the right size of your tank

CPR CS Overflow Boxes

You need to have an Aqua Lift pump connected to it permanently. Without it the siphon will gradually reduce due several things such as air bubbles, brown outs and what have you. You can prevent flooding by setting the normal level of sump so that there is enough space for extra water when brown out occurs. Another way is set nozzle of return just at the surface of water or drill a hole just a little below water surface so that backflow will not happen. Some use check valve at the return pipe.
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Old 06-10-2014, 08:53 PM   #8
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Again. Aqualifter is unnecessary. I don't use one. I never get air bubbles in my siphon tube. Siphon never breaks unless I break it manually.
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Old 06-10-2014, 08:58 PM   #9
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Again. Aqualifter is unnecessary. I don't use one. I never get air bubbles in my siphon tube. Siphon never breaks unless I break it manually.
How do you prime your siphon without an Aqualifter pump?
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Old 06-10-2014, 09:01 PM   #10
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It's always primed. Even when power failure. Like last night. As long as you don't have air bubble buildup there is no issue.

Primed first time with a tube stuck up the back end. Never again.
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