Use the exact model's instructions and a reliable value for the actual water reaching the appliance. The setting should not be guessed from a broad town description.
Understanding this situation
A household water-treatment system can change the supply compared with a general local value. The appliance may use the hardness setting to manage its softening arrangement, so product and model guidance matter.
A useful next step
Check the water supplier or documented treatment information and follow the manual's adjustment procedure. Do not enter hidden service menus. Record any change when comparing deposits or drying results, rather than changing several products and settings at once.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.