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.

The descaling process:

  1. Add 120g of hot water to the boiler, along with 10g 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, and wait for a further 5 minutes while the Heat exchanger coil descales.
  4. Separate the machine the and carefully discard the hot water within it. 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 Porafilter, 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.