I've got 2 buckets in my loft which were connected to an inbuilt compressor / bubbler. In the loft there's not a noise to be heard but once downstairs again it sound like a thunderstorms happening there ( ok slightly over the top but loud enough for people to question if they come and visit ). I've changed the inbuilt bubblers now for a normal compressor that sits outside the tent with the tubes going in but the noise is still there and possibly louder. The noise / vibration definately isn't coming from the compressor as i've undone the tubes while leaving it running, it's coming from the actual bubble stones. I've put thick foam under the stones to try and stop vibration ( if it is vibration ) but this doesn't help. Any ideas would be greatly received.
Thanks.