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Discussion Starter #1
Hi,

Question on canister filter, I'm resetting my tank, and do a full cleaning of my filter.

After putting everything back together, and plugged in, the filter make a rattling noise. The water coming out from the outlet is also very slow and sometimes is pushed back (no water).

Is this indicates faulty impeller? or just a bad priming?

How can I be certain? Any help is much appreciated.

Thanks
 

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Was the impeller put back correctly? First rock the canister gently back and forth/side to side to get all the trapped air out. If things don't improve, recheck that everything was put back correctly, trays are flat etc. Some canisters can be tricky.
 

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From experience it was usually trapped air that made the impeller rattle.

If your canister doesn't have a primer/air release valve, I used to literally blow a few seconds into the intake tube to force the water to push the air out. Then quickly submerge the tube back into the water to stop any more air from getting in.
 

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From experience it was usually trapped air that made the impeller rattle.

If your canister doesn't have a primer/air release valve, I used to literally blow a few seconds into the intake tube to force the water to push the air out. Then quickly submerge the tube back into the water to stop any more air from getting in.
I'm using lily pipes for the intake and output. Is there a way to blow into lily pipes intake?



Was the impeller put back correctly? First rock the canister gently back and forth/side to side to get all the trapped air out. If things don't improve, recheck that everything was put back correctly, trays are flat etc. Some canisters can be tricky.
I suspect the same thing at first since, the output flow is very slow, and sometimes it was pushed back the hose. I already give it a good shake (not gently at all :))

I'll recheck everything because right now I have doubts on how I put back my impeller. It seems it has some space to move. (I'm using Eheim Classic 250).
 

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Discussion Starter #5
I just realized when I take out the impeller, the ceramic shaft (is this correct? The black cylinder like thing) is left in its place. I thought it come together with the impeller blade. Is this normal?
 

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I just realized when I take out the impeller, the ceramic shaft (is this correct? The black cylinder like thing) is left in its place. I thought it come together with the impeller blade. Is this normal?
The ceramic shaft & impeller are one connected piece.

Sounds like yours has snapped somehow.
That would explain both the rattling & weak water flow.
 

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Discussion Starter #7
Seems like it. The bottom of the shaft also detached from the shaft.

While waiting for the new impeller, can I just glue the shaft to the impeller rod?
 

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I honestly don't think there's a glue on the market that's either non-toxic or strong enough to secure a spinning component.

Don't know how big your tank is or how much fish you have in it but maybe utilise an air stone & pump (if you're not using one already) to oxygenate the water & maybe 20% water change depending on how long you're waiting for the replacement.
 
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