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#1
02-25-2009, 05:50 AM
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The answer to your question is cavitation
I had the same problem with a Iwaki return pump on my old 330G reeftank Just put a ball valve or gate valve on the output side and throttle back the output a bit bubbles gone 
__________________
Steve “The most important decision you make is to be in a good mood.” ― Voltaire 
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#2
02-25-2009, 02:38 PM
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Not necessarily cavitation but something similar. Could you describe what the plumbing looks like from the sump to the pump? Likely this part of the plumbing has too much restriction which results in a low pressure situation. If the pressure is low enough dissolved oxygen will actually be liberated from the water, a very common problem that most never figure out and usually blame it on a pin hole which is actually pretty ridiculous when you think about it.
A quick fix is restricting the output flow of the pump as already mentioned, this will in turn increased the pump intake pressure. A better fix is to plumb the pump properly.
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#3
02-25-2009, 02:56 PM
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Restricting the output of the pump will reduce the cavitating, however if this system has been up and running for some time then this should not be the issue, and it sounds more like a restriction on the input side.
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#4
02-25-2009, 03:56 PM
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Well I did all that was mentioned and then hubby did the same. The pump will work fine, then suddenly have little to no flow, and then the bubbles with low to almost no flow. It has worked fine for abut five weeks since it was installed, and now for no reason at all it seems, it is doing this... I removed it and cleaned it but there was nothing in it at all.
It was not too bad at lights on but now it hardly flows at all and I have billions of little bubbles then none... then bubbles etc... etc... We paid $600 for this pump and will be buying a different brand sooner then I would like. Prior to this one, we had an Iwaki and the same thing happened after about a month.
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#5
02-25-2009, 04:35 PM
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I'd be taking it back to whereever you bought it and raise a fuss. See if it's maybe common with that brand?? Sorry about the luck
__________________
75 gallon with 20 gallon sump in the works. R. Bacchiega. Tattooer I didn't smack you, I simply High Fived your face. I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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#6
02-25-2009, 04:40 PM
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I have a serious desire to come out there at some point and look at your sump. If this is the second pump that's done this, then something is up. Nobody is this unlucky (trust me, I know a thing or two about unlucky
 ) Something is not right about something, but without a detailed look I can't really speculate based on your descriptions (sorry, what I mean is, I can't visualize the setup)..
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! Last edited by Delphinus; 02-25-2009 at 04:48 PM.
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#7
02-25-2009, 05:02 PM
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The first pump was not nearly strong enough to run the system. The LFS guy took a chance in selling the substandard pump for our needs, but he did the same for our skimmer as well. He ordered the new pump and we paid extra for it. When I brought the two week old skimmer back, I lost $100 on it and only got store credit.
24storm has been to my house a couple of times and he said everything was awesome. I do think it is bad luck to be honest. Quote:
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