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Old 07-17-2004, 08:26 AM   #11
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Originally Posted by Brad
Why not put a powerhead on a "U" type? If "U"s are that reliable, they should be super reliably with a power head to ensure they restart.
If it's set up properly, the powerhead isn't really necessary. The problem that folks have run into in the past is that when the power comes back on, the powerhead doesn't restart. That's why I wouldn't use anything other than a maxi jet on them.

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Old 07-17-2004, 08:55 AM   #12
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I have also found that the size of the overflow box would not allow for the powerhead, nor lines from the powerhead to the tube to fit. It is a pretty tight
squeeze in there.

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Old 07-17-2004, 09:28 AM   #13
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Unless you run the U tube at a rate much slower than its rated for, 200gph on a 600gph overflow, for example there wont be air collecting at the top of the U tube. The flow rate is so fast thru the tube that air gets pushed along by the water. The overall flow rate might be the same on the C shell style but the speed that the water flows is slower because there is greater surface area for that water to move thru thus air has time to collect at the top.

For a snail to get into the U tube, and Im not saying it hasnt happend before, its quite an adventure. First the snail has to get over the oveflow fingers. This usually means venteruing out of the water for a period. Then the snail would have to make its way down the inside of the overflow box. And then find a spot on the back of the overflow box to hitch a ride on the U tube thats sitting inside the overflow box. They would then have to travel down the U tube and turn up inside the tube itself. Depending on how close the bottom of the tube is to the bottom of the overflow box the snails shell may physically not even fit between that space.

In the c shell style the back of the overflow box is part of the water channel that routes water up and over the back of the tank.
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Old 07-17-2004, 12:45 PM   #14
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I have a CPR CS90 on mmy 55g tank.. It works great.... It was a pain and constantly wanted to overflow without using some sort of pump.. I ended up going wiht an Aqualifter pump and have never had an issue since... I am having a custom u-tube overflow that will handle atleast 1600gph made for me by a friend so hopefully i will have the same luck..

I really like the CPR style overflows though.. And thats a personal experience.. Just get the 12.00 aqualifterpump that goes with it.. check out www.amekaaquatics.com and you can get factory seconds on the stuff for pretty cheap as well..

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Old 07-19-2004, 09:19 PM   #15
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I discovered a 6" brittle star living in my CPR overflow. I had been wondering why I hadn't seen him in some time. I estimate he had been in there for two weeks. The mesh caused him no trouble at all as they are masters of the tight squeeze.

It was quite difficult to get him out actually.

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flow, overflows

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