The bubble counter is used to detect the amount of CO2 that is released into the aquarium.
The bubble counter must be filled with 2/3 aquarium water, in order to achieve a good function.
The arrow on the bubble counter shows the direction of the administered CO2.
This arrow always points in the direction of the Ceramic Diffuser.
The set-up of the CO2 tube happens with lukewarm water and must be carried out very carefully, as to avoid breaking the glass.