While working, but ...

is of the processing not as good as you expect from Jewel.
The air hose, which is inserted between the diffuser tube and the EInsaug controller, uses very quickly, or tear with time. This means that you have to cut the hose either with scissors (so that the torn body is gone), or at some point must necessarily be replaced by a new hose (normal green air hose from my air pump fits).

In addition, the diffuser can be a bit noisy:
You can see the air while having a regulator set up, but even the smallest bubbles pretty setting.
Who has sensitive ears, and the aquarium is standing in the bedroom, for example, could possibly be bothered by it.
I have the aquarium in the living room, and when the television is on, taking the noise is not really true. But if the television is off, you can hear just the bubbling of the diffuser already.