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Noisy cannister filters
Roger Miller wrote, in a discussion on using a cannister filter as a CO2
"Gas -- I think it's mostly air drawn
through the o-ring seal -- sometimes accumulates at the top of the
canister and that can cause some noise."
I have an Eheim 2260 (the BIG one) that I use on my 130 gallon aquarium. I
don't use it as a CO2 reactor. The intake for the filter is reliably under
18" of water at all times, yet it (the filter) burps and gurgles all the
time. If I shake the unit, a large "burp" of trapped gas will come through
the output tubing and gets released into the tank (it doesn't seem dangerous
and it doesn't smell of sulphur). It has never dawned on me that air could
be being drawn into the cannister through the o-ring seal (its been a while
since I've replaced the o-ring and I don't use any petrolium jelly on the
ring to seal any minor leaks).
Could this be the source of the gas which causes what I have observed?