Scale depends on the hardness of tap water, which varies in every region. Sooner or later scale will occur in devices that use tap water (e.g. water kettle, coffee maker). In the earlier stages, scaling is mainly a visual deficiency, but later on it can result in serious problems or worse, the breakdown of the device. Such a breakdown usually calls for replacement of the device since it is not economical to repair a machine that costs around of 5000HUF.