Is there little fizz on the water (sparkling water not good)? Is the pressure gauge lower than 3.5 bar? Time to replace the CO2 cartridge.
- Unscrew the pressure gauge from the empty bottle (this may release some gas).
- Keep the bottle separate and hand it over during the next maintenance
- Remove the seal of the new CO2 cartridge
- Screw the pressure gauge on the new cartridge
- Open the bottle and the pressure gauge is automatically back at 4 bar.