With this feature, it is no longer necessary to use distilled water in the container as recommended by the manufacturers. Only in hard water areas should you fill the reservoir with a ratio of 1:1 distilled water and tap water. Descaling is carried out using either chemicals (which soften the water) or on the mechanical base. By pressing a button, the descaler enters the resevoir, removes the limescale, and washes it out through the holes in the soleplate.