Pop-up fountain embodiments are provided which successfully combine aesthetics, utility and ease of installation and are thus especially suited for installation into spas, hot tubs, pools and the like. The alloys are iron based and include nickel, boron, silicon and optionally chromium. The method includes the steps of dividing a heap area of the memory into a number of sub-heap areas; managing the sub-heap areas; and changing the number of sub-heap areas used for garbage collection based on a magnitude correlation between a required time for the garbage collection and a predefined target value. Important applications include delivery of missing DNA sequences for gene therapy and delivery of antigens or DNA encoding antigens for vaccination. The example apparatus also includes a lock to hold the rod in a first position on the housing where the rod is to disable a supply of the fluid to the bore. The wireless communication circuit is connected to a sensor having an electrically conductive element that can be comprised of a nonmetallic material, such as a carbon-based ink.