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Old 02-03-2009, 05:03 PM   #1
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Canister return spitting bubbles

My Marinelife canister filter regularly (a few times a minute) spews little bursts of microbubbles into the tank. It's pretty much been doing this since I got it, but it's getting worse.

I clean it regularly, and in fact just cleaned it a few days ago. Anybody know what could be up and how to fix it?
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Old 02-03-2009, 06:12 PM   #2
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i dont really know all that much about the units but it has to be 1 of 2 things (at least that i know of) the pump collecting air from an external source or a loose/hole in any inlet pipe?


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Old 02-03-2009, 06:21 PM   #3
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It has to be getting air in it somehow. Have you made sure of all the connections being secure?
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Old 02-03-2009, 06:32 PM   #4
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thanks, guys.

i'll double check the connections and make sure everything's secure.
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Old 02-03-2009, 08:23 PM   #5
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Also make sure the inlet is not next to a bubbler or too close to the surface where it can suck in air.

The leak can be an ill fitting o-ring, so make sure you seat all of them. You might want to grease the o-rings with petroleum jelly for better seal.
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Old 03-08-2009, 06:48 PM   #6
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I have a fluval 405 did the same might have air lock what i did was block of the inlet tube for second or two till u feel some presure then let go
some time little bit's of air get trapped espesailly if you been cleening it lots

pleased if i could help
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Old 03-10-2009, 08:05 AM   #7
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I solved my leak with the help of Ruadh.
I have a Rena XP 2 that was spitting air. It was driving us nuts.
I checked everything and couldn't find a leak. Put new vinyl hoses on it,
cleaned the impeller assy, re lubed the o-rings & seals.
The original hoses were opaque. The vinyl ones are clear, when I lookied
at the intake hose while it was pumping, I could see air bubbles. So I taped it up.

Here is my first thread:
Rena SP2 pumping bubbles

Then I found ABOUT where the leak was:

http://www.aquariumadvice.com/forums/f60/to-all-rena-xp-owners-113479.html

It took a LONG time to find the problem. The XP is now back to it's old quiet seld.

Good luck
Charles
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