Effective limescale protection (SLC function): Thanks to the soft elastomer surface, limescale deposits can be removed very easily. Simply rub off the limescale on the elastomer surface. Automatic cleaning function of the attachment sieve (Auto-Clean function): Small dirt particles in the water are rinsed out Aerator does not have to be dismantled for cleaning.Vandalism protection: no more pressing in of the screens possible.Soft comfort jet.Not suitable for non-pressurized water heaters.