Why aren’t any bubbles coming out of my filter?
According to your description, a small bubble appears periodically in the impeller housing of the CristalProfi and is then transported out of the filter.
If air enters the filter system, this may be an indication that a seal is no longer tight or that connecting pieces don’t close tightly, for example. Since there is a constant slight low pressure during operation, this doesn’t necessarily become noticeable. In the event that there is a leak of this kind, you can test by switching off the filter temporarily, in which case a small amount of water would escape at the leaky spot. Caution: This test should only be carried out with careful monitoring.
Another possibility: The filter material may be very heavily soiled, which may result in the formation of fermentation gas which is pressed out of the filter periodically.
The third possibility: Adding carbon dioxide through the suction nozzle, which we discourage.