If you live in a hard water area, you may find that limescale deposits build up inside the 9Barista boiler, and around the heat exchanger coil. Small deposits of limescale are not a problem, but if too much is allowed to form, it can begin to interfere with the function of the machine.

If you notice large limescale deposits forming, or if there appears to be a restriction in the flow path through the machine, we recommend running a descaling cycle.

Please note: it’s very important that you follow these instructions closely, as there may be a risk of causing aesthetic damage to the plating of the machine if you do not. This is possible if the wrong concentration of citric acid is used, or if the machine is heated during the descaling process.

The descaling process:

  1. Add 100g of hot water to the boiler, along with 8g of food grade citric acid crystals. Citric acid can be purchased on Amazon. (We don’t recommend using descaling tablets, as these often contain surfactants which cause the water in the upper chamber to foam up and overflow).
  2. Stir the contents of the boiler to ensure all the crystals have dissolved, and wait for the fizzing to stop (about 5 minutes).
  3. Assemble the Group head on to the Boiler, without fully closing it, and wait for a further 5 minutes while the Heat exchanger coil descales. Note: it’s important that you don’t run the machine while it descales, as this may remove some of the plating.
  4. Separate the machine, carefully discard the hot water within it and give all the parts a good rinse. If limescale remains on the inside surfaces of the boiler or heat exchanger coil, repeat steps 1 to 3.
  5. Once all the limescale is removed, fill the machine with 120g of fresh water, assemble the whole 9Barista machine without adding any coffee to the Portafilter, and heat the machine in the usual way.
  6. Once water has appeared in the top of the Portafilter remove from the heat, and carefully discard the hot water within the machine. You can now air dry the components.