First of all, we advise you to descale the device via the settings. You can find this via the menu at the bottom left of the home screen. Descale the appliance in its entirety via this menu and also use descaling agent. If you get the message again very quickly, the device can be set according to the lime in the water. Descaling can be set in the settings under 'device settings'. By default it is set to 2 drops: 'level 2' Level 1: 880 cups, equivalent to Hardness Test Indicator Paper 50 mg/L or lower Level 2: 440 cups, equivalent to Hardness Test Indicator Paper 120 mg/L or lower Level 3: 280 cups, equivalent to Hardness Test Indicator Paper 250 mg/L or lower Level 4: 220 cups, equivalent to hardness test paper 425 mg/L or lower/higher