We finally got our 90 gallon tank put together. I have two Eheim 2217s for filtration, purchased new at the same time. One runs whisper quiet and the other has a constant hum, which has been constant for a few weeks. I do not think it is air, since I have turned, shaken, repacked and re-primed the canister a few times. Plus the sound is different that the sound of air. I have found when I push down on the head, the noise level goes way down. O-ring looks good and has plenty of grease.
Any ideas?
Thanks!
Any ideas?
Thanks!
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