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Old 06-13-2015, 10:35 AM   #1
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What makes a canister hum more?

I have four SunSun HW404B filters, and one Fluval 306.

I bought the Fluval first, and you can tell which ones I liked better.

However.

One of them... naturally the one in my office, is getting louder. Substantially louder -- from almost dead silent, to now being audible over my computer (which I sit next to), and actually audible from the next room if it is quite. It was nowhere near that noisy before.

I recently cleaned it thoroughly, including the impeller, added some lube, then finally replaced the shaft on it (ok, I broke it while cleaning it for a second time), cleaned the impeller, cleaned the impeller recess.

What makes a canister hum when it didn't before?

I've twisted it, shaken it (it's not air), made sure it is not resting on something that would amplify the noise like a cabinet side. The noise is mostly hum, not water movement.

I've never opened the casing for the motor itself (not even sure if one can, I know some pumps are encased in epoxy for safety reasons, have not looked). Not sure if there's anything that can become loose in it.

I've turned off the UV light (in case it was a separate transformer to power it) and no impact.

So what makes a canister hum? And any suggestions, other than swapping it out. I may swap for one in another room, though I kind of hate to move the noise there either.
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Old 06-13-2015, 10:36 AM   #2
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Incidentally the change came over a period of about 9 months, slowly. It was not "break" where suddenly it was loud. It just got worse.
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Old 06-13-2015, 11:07 AM   #3
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Sounds pretty clean!

Assuming there is good water flow from the outlet still? That's all I can think of is if the water flow is getting blocked, the pump will be under pressure and could hum more.
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Old 06-13-2015, 11:57 AM   #4
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Yeah, good flow, in fact after cleaning (it was pretty awful) the flow went way up, but no change in noise. If I stop the flow, I get a fair amount of clacking as you might expect, but this is more of a hum. Though since the rotation is synced with the 60 cycle current noise in the rotation may sound similar to a hum, so it's hard to tell.

I think Iv'e got a spare impeller. This (of the five canisters I have) is by far the hardest to get to -- naturally -- so when I get ambitious will take it out and swap impellers and see if it makes a difference. I know it wasn't broken, but maybe it's warped slightly or something similar. Short of disassembling the case not sure what else I can do, but it might be time for a different one.
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Old 06-13-2015, 03:47 PM   #5
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I have seen canisters hum from being over full with water and also under full they are very temperamental , if water level isn't just right they tend to be loud I would use that hum to your advantage , knowing canister needs attention
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Old 06-13-2015, 03:49 PM   #6
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Quote:
Originally Posted by 54seaweed View Post
I have seen canisters hum from being over full with water and also under full they are very temperamental , if water level isn't just right they tend to be loud I would use that hum to your advantage , knowing canister needs attention
I'm sorry, I thought a canister was by definition completely full if it didn't have air in it. Can you elaborate a bit on what "over full" means in this context, and how I might check?
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Old 06-13-2015, 04:16 PM   #7
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most canisters have water level marks stamped into the plastic on inside of canister ,
the one I have has 3 marks low , min , and max any other levels tend to cause the pump to hum , the wet dry canister I have looks like a computer CPU , and is one of the best I've ever used I'll get a pict in a few min and attach to this same post

Ok here's 2 picts I keep mine in a 30g tank that is also utilized as a ATO
my canister is marked in marker so I see levels since it's in a tank I can't see the stamped marks on trays inside canister
I'm in cleaning mode but you'll get the idea
both side view and top view


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Old 06-13-2015, 04:23 PM   #8
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That's.... different. In this one, the pump is actually at the top. Until the media area fills and actually over-fills, the pump is dry. I don't think this one works the same way as what you have (nor does the Fluval).
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Old 06-13-2015, 04:58 PM   #9
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just added picts to post #7
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Old 06-13-2015, 05:00 PM   #10
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Interesting. Is this more like a sump, where it's open to the air on top? The canisters I've seen are sealed, water coming in via one tube and out by another, no air inside at all.
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