Over time, your steam iron, steam generator or garment steamer will start to build up calc or scale; this happens in all electrical appliances that use water. The harder the water in your area, the faster scale impurities will develop and solidify if not cleaned away. Without regular descaling, you will find that scale is pushed out of your appliance in the form of white/brown stains and that the steam output is compromised. Be sure to clean your iron regularly to maximize the performance of your appliance.