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Old 12-23-2007, 09:28 PM   #1
nobody
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need diff. explain tube overflow box vs. cpr overflow box


can someone tell me the pro and cons of the CPR overflow box with the aqua lifter pump

and the pros and cons of a tube style overflow box like the eshopps
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Old 12-23-2007, 10:22 PM   #2
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someone has had to use an overflow box before
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Old 12-23-2007, 10:34 PM   #3
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I wish I could help on this but I've only had one of those overflow boxes with the u-tube before.

As a matter of fact, I just put it on my temp tank about 20 minutes ago lol
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Old 12-23-2007, 10:37 PM   #4
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The CPR is not a good idea in my opinion anything that has to use a power source to keep bubbles out of it is a problem waiting to happen. A properly set up U-Tube type will work great and not have issues of building up air in the top of the tube. And, if h outer box is designed right it wont loose siphon even in a power failure, it will automatically start back up when the return pump raises the level in the tank.
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Old 12-23-2007, 11:50 PM   #5
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I agree with motorslave.

There are more bad reports about CPR (Weir) Overflows than good. I use a U-tube and only had it fail once when a large cowrie blocked the tube.

HTH

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Old 12-23-2007, 11:53 PM   #6
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I never understood how CPR could market those. It needs a pump because it is a flawed design.
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Old 12-24-2007, 01:22 AM   #7
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From recent experience (OK, over the past year), I've had the siphon break on my dual u-tubes numerous times. The fix though was replacing my return line with double the size tubing, increasing the amount of flow considerably. Haven't had a problem since and of course this is after I remove my canopy. Wish I would have known a year ago and my Dart is more impressive now.
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Old 12-24-2007, 01:27 AM   #8
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Properly st up they work great. The velocity of water through the u-tube is key. The level in the outer box needs to be quite a bit lower than the level in the inside box, the longer drop makes a higher velocity and this prevents bubbles from building up.
But, also, like Ronjuniors experience showed, you need to have the water there to pull!
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Old 12-24-2007, 02:53 AM   #9
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I ran a U-tube for many years and never had a failure. It was a lifereef. My budy had a CPR and it failed once a month. it is a flawed design and an accident waiting to happen. I would not think about running anything other than a good U-tube overlfow.
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Old 12-24-2007, 06:41 AM   #10
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Also the CPR would be harder to keep clean.
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Old 12-24-2007, 07:30 AM   #11
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i cant fit the outer box with the u tube in the back sump of the aquapod. i was going to run the u tube without the skimmer box attachment. would that be ok??????
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Old 12-24-2007, 10:15 AM   #12
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i don't see why it wouldn't be ok to do it that way.....unless there was a power outage and it broke siphon by the water level dropping too far...
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Old 12-24-2007, 10:17 AM   #13
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the only thing i can think of if the power goes out wouldnt it drain the back sump until the bottom of the u tube was exposed. i could just cut the u tube shorter on the side that goes into the back sump of my aquapod
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Old 12-24-2007, 10:18 AM   #14
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hahaha... i was editing my post as you replied..LOL
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Old 12-24-2007, 10:29 AM   #15
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actually i am going to drill a hole in the u tube below the water level. that way when the power goes out it will only drain to the hole then it will break siphon
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