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Old 11-10-2017, 04:56 PM   #1 (permalink)
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Default Gas in eheim

After running quietly for about a month or so my Eheim 2217 has started making noise from bubbles going through the impellor.

I've run Eheims for years, and I don't think this is trapped air from when I set it up. I also have a 2213 running on the same tank, which is silent.

I've checked for water leaks. None.

All the hosing was connected by dipping in hot water to soften before pushing over the barbs and hand-tightening the connectors. Everything seems like it should be fit snug.

Perhaps air is getting through the O-ring on the pump housing? I'd expect this to leak, though.

The filter is mostly filled with Seachem Matrix. Could the anaerobic bacteria in this media be producing enough gas to make audible noises when it hits the impellor?

There's an inline diffused on the output, but it's a fair bit away from the impellor, and I'm hearing gas even when the CO2 is turned off.

Bit stumped on this one, so figured I'd see what others had to say before I spend money to replace all the hosing, O-rings, and emptying the media basket.
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Old 11-10-2017, 05:02 PM   #2 (permalink)
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Default Re: Gas in eheim

this happened to my hydor exactly as you say,
I ended up getting it replaced by the company. (hydor)
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Old 11-10-2017, 05:12 PM   #3 (permalink)
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Default Re: Gas in eheim

It's a pretty old filter. I've been running it for about... Wow, 10 years now?
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Old 11-10-2017, 05:26 PM   #4 (permalink)
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Default Re: Gas in eheim

Dang! maybe its just getting old?
I'm sure its a part though.
When I first contacted hydor about this issue, they said to look at the Impeller... maybe that means something of value to you? is the impeller chipped or anything?
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Old 11-10-2017, 05:38 PM   #5 (permalink)
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Default Re: Gas in eheim

Nope, impellor's in great condition. Even if it was chipped, that shouldn't explain gas bubbles in the canister.
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Old 11-10-2017, 05:44 PM   #6 (permalink)
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Default Re: Gas in eheim

Idk I'm just passing the info I got, along to you lol.
Yep idk, contact eheim for some extra help if you'd like.
Hopefully hoppy or something can hop (PUN SPOTTED) in here pretty soon to help ya.
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Old 11-14-2017, 09:03 AM   #7 (permalink)
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Figure it out?
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Old 12-29-2017, 08:17 PM   #8 (permalink)
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Default Re: Gas in eheim

Quote:
Originally Posted by Skizhx View Post
Nope, impellor's in great condition. Even if it was chipped, that shouldn't explain gas bubbles in the canister.
Check the impeller shaft play. Take impeller and shaft out of motor head. Then insert the shaft into the impeller and try to wiggle the impeller on the shaft. If there is any side to side movement then it is time to replace the impeller. After 10 years I would do both. The ceramic impeller shaft is durable but will wear. A new impeller and shaft will have zero play.
The sound you describe is exactly what a worn impeller shaft hole sounds like. The rest of the impeller can look perfect so do not be fooled.
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