Canister filter air bubbles?

C

Chowdan

AC Members
Sep 3, 2010
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Hey all,

My canister filter is about 2 weeks old. It works great! After setting it up and letting it run for 15mins I started to shake it. The sounds of air beung pumped would happen. But after a few shakes I stopped. I haven't touched it sense.

I did a water change of 20% on monday. I shut the pump off and via just unplugging it. As of about 2 hours ago my filter is starting to make the air bubble sounds. My connections are all tight with no signs of leaking. I did lower the intake flow from max to 3/4 open. Could this be the reason?

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What specific canister filter do you have (make and model)?
 
When you clean a sponge you leave behind lots of air that can take a while to work itself out. Also is there an airstone or something that bubbles near the intake?
 
Hi Chowdan. It differs a bit depending on which canister filter you have. In a more general sense though, it sometimes helps to lift the canister up and lean it sideways one direction or another. Shaking the filter doesn't do the same thing.

The noise you described sounds like some trapped air inside the canister that isn't getting out. By tilting it horizontally for a few moments, the displaced air will shift to another position where the motor will use water to push the air out. This is more common an issue with canisters that don't self-prime themselves very well. (Also could be that intake thing where the filter is drawing in air bubbles from an airstone too close to the intake).
 
Thanks for the replies. I figured out the problem. I lowered the intake and had the output full open. Im still not sure and a little concerned how air got in since the airstone is nowgere near the intake. But its fixed and ill keep my eye ipen for leaks

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If you restricted the intake somehow then the air could have been sucked out of the water through a process known as cavitation. If you want to reduce flow, always do so on the output side.
 
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