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Old 07-16-2004, 08:55 AM   #1
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"U" vs "C" overflows

I'm working on getting a 55g FOWLR going and I'm in the market for an overflow. I've been looking at the C type overflows because they seem to have a higher capacity in a smaller package. But, I just read somewhere that they don't maintain their siphon well. Is this true? Can you guys share your experiences with either type?

Thanks in advance!
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Old 07-16-2004, 10:31 AM   #2
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What kind of flow rate do you need? I have a U tube overflow thats rated upward to 1400GPH. So dont get tricked into thinking U tube overflows will only do 600-700GPH.

Yes the c shell overflows suggest you have a powerhead attached to the overflow to maintain the syphon and to help with the startup of the syphon when a power outage occurs. U tube overflows dont have such issues if they are sized properly and are maintained properly.
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Old 07-16-2004, 01:34 PM   #3
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I don't think I need a tremendous flow rate with only a 55g, but I was under the impression that with comparable flow rates, the C type would be smaller. True or not true?
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Old 07-16-2004, 04:42 PM   #4
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Yes the C style overflows take less space in the tank.
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Old 07-16-2004, 06:43 PM   #5
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Ok, so is the possibility of it loosing it's siphon a huge deal, or if I have a power head that will accept the air line tubing and will suck the air out of the C am I ok, or are they pretty much equal and I should just get the proper flow rate, and not worry about what type I get?
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Old 07-16-2004, 08:42 PM   #6
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In my house losing syphon is a big deal. That means upward to 25 gal on the floor should the tank lose syphon the pump in the sump will not stop. So it will overfill the tank and the water winds up on teh floor.

The c shell style do often suggest a powerhead to help keep air out of the C area. Its important to pick a relyable powerhead. In my book stay away from RIOs for this function as they are not overly relyable to start up when you neeed them to be.

U tube overflows dont need the powerhead to keep the syphon but the down side is they are a bit more bulkyi nthe tank as they have a 3/4" - 1" hose going up and over the side of the tank vs a low profile but long C shell type syphon.
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Old 07-16-2004, 08:45 PM   #7
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I would like to add that these are my views on the different types of overflows and there are many folks who have used the c shell overflows and have no issues with them.
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Old 07-16-2004, 10:04 PM   #8
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Hey, thanks for the input! I didn't mean to sound like lost siphon isn't a big deal 8O . What I meant was, is there conciderably more risk of it happening witht he C type vs. the U.

Again thanks for your input!
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Old 07-16-2004, 11:39 PM   #9
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The only C type overflow I have ever used was the Marineland model. I can say that losing the siphon would have been a problem without the MJ1200 powerhead that I had attached to it. The C tube collected a lot of air. I have never had this problem with a U tube overflow. If you do decide to go with the C type, I would use either an MJ900 or 1200 powerhead on it and I wouldn't even consider any other type. JMHO.
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Old 07-17-2004, 12:28 AM   #10
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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.

Bear in mind that the siphon can stop for other reasons besides air. The most common would be some sort of object (ie. snail) blocking the tube. Do what you can to guard the entrance to the siphon.
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