Effective limescale protection (SLC function): Thanks to the soft elastomer surface, limescale deposits can be easily removed. Simply rub the limescale off the elastomer surface. Automatic cleaning function of the pre-filter (Auto-Clean function): Small dirt particles in the water are flushed out, and the flow regulator does not need to be disassembled for cleaning. Vandalism protection: no more indentations on the screens. Soft comfort spray. Not suitable for pressureless water heaters.