I need pump help

2quills

2quills

Well-Known Member
Yeah the CPR design is best used with the pump. The Eshopps overflows (u-tube style) don't require a pump. Most would say they are fairly reliable without the aid of a pump and they weren't designed for one but I have seen folks modify them to run aqua lifters in some cases.
I thought we wen't over all of this back in the sump fuge thread lol...I don't mind a little rehash though. IIRC, one of the biggest reasons for chosing the CPR was the low profile design inside of the tank. But you are by no means stuck with having to use a CPR and an Aqua Lifter.
 
flower

flower

Well-Known Member
Quote:
Originally Posted by 2Quills http:///t/394402/i-need-pump-help/20#post_3510842
Yeah the CPR design is best used with the pump. The Eshopps overflows (u-tube style) don't require a pump. Most would say they are fairly reliable without the aid of a pump and they weren't designed for one but I have seen folks modify them to run aqua lifters in some cases.
I thought we wen't over all of this back in the sump fuge thread lol...I don't mind a little rehash though. IIRC, one of the biggest reasons for chosing the CPR was the low profile design inside of the tank. But you are by no means stuck with having to use a CPR and an Aqua Lifter.
To be honest, I don't understand how an overflow box even works. The reason (if memory serves, and lately it doesn't) we went with the CPR was that you said it was more reliable and wouldn't cause a flood...which was my greatest fear concerning sumps at the time. The system on the 90g has run perfect...the only trouble I have is on the one I designed coping it for the 56g.
I can't imagine why someone would modify an overflow box to use a lifter pump, when it isn't needed. For now I'm going to get the pre-filter gizmo and put one on each of the lifter pumps on both tanks. That should cure my clogging problem. I don't want to bother to redo the whole return on the 56g right now...I won my bid for the male and female potbelly seahorses on e-bay, so that's it on my fish budget for the month of February. YAY!
 
flower

flower

Well-Known Member
Quote:
Originally Posted by FishHugger http:///t/394402/i-need-pump-help#post_3510836
Over time air bubbles could get trapped inside the top of the upside down U shaped chamber. If enough air accumulates in that chamber it would break the siphon and cause a catastrophic overflow. Having the lifter pump continuously running helps to ensure that any air bubbles will be sucked out of the chamber to prevent that scenario.
I have a CPR overflow now also, that I will get running tomorrow. You need to have a check valve after the venturi so it will not allow water to flow backwards into the CPR overflow Then you COULD run it without the pump, but its probably a bad idea......even with the pump you need to have the check valve which CPR was so kind enough to not provide =P.....even those its only like 50 cents
I just saw this post...I was on pg 2 and this post was the last on pg 1.... After reading your post on the air bubble thing, I remember now why I worried about an overflow and we went with the CPR. I kind of know what a check valve is (a little gizmo that allows flow only one way...correct?) What happens if a check valve isn't used? I have had the 90g running for over year without one, and I didn't put one on the 56g either...how does it help?
 
2quills

2quills

Well-Known Member
Check valve isn't needed if you have the end of the output hose from the aqua lifter under the water's surface. Keeps air from getting sucked back into the overflow and losing it's prime. I think all overflows have their pro's and cons. I wouldn't place the potential for one external overflow as being largely greater than any other for it's potential to have a flood occur. Drilled tanks pretty much eliminate the whole need for a siphon in the first place. And that in itself is a huge redundancy over external overflows.
 
flower

flower

Well-Known Member
Quote:
Originally Posted by 2Quills http:///t/394402/i-need-pump-help/20#post_3510852
Check valve isn't needed if you have the end of the output hose from the aqua lifter under the water's surface. Keeps air from getting sucked back into the overflow and losing it's prime. I think all overflows have their pro's and cons. I wouldn't place the potential for one external overflow as being largely greater than any other for it's potential to have a flood occur. Drilled tanks pretty much eliminate the whole need for a siphon in the first place. And that in itself is a huge redundancy over external overflows.
Yep...next tank shall be drilled indeed. I'm getting those pre-filters that are made for the lifter pumps, that should help considerably with my clogging issues. I ordered 4, so that I have an extra back-up for each pump...if it comes apart that would be great because I could put fresh fiber in it, I haven't gotten it yet, so I really don't know much about how it's made...I'm going by pictures.
 
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