Follow the instructions in your personal instruction manual for descaling your machine as techniques vary according to the model you own.
We recommend using the descaling product provided by the manufacturer.
Otherwise, you may use 2 tablespoons of tartaric or citric acid (both sold in pharmacies and drug stores) diluted in a half-litre of lukewarm water; pour this mixture into the water tank.
For a daily average usage of 4 cups and if the water is hard, we recommend descaling your machine at least every 3 months.
If you live in an area where the water is very hard, you may wish to descale more often.