A showerhead having a replaceable water filter assembly. In an example embodiment, the mobile device is automatically paused upon entering a street and resumes when the user has crossed the street. In other embodiments, the wireless signal may include a detector signal that requires further processing to determine the occupied state of the space. First, it designs the abstract implementation in the problem domain in terms of an Intermediate Language that is unfettered by programming language restrictions and requirements. The filter element is supported in a diffuser tube received in the tank opening. The method comprises transcervical access and blocking of blood flow through the common carotid artery, shunting blood from the internal carotid artery and treating the lesion in the carotid artery.