A method and apparatus for the descaling of metal surfaces without the use of caustic substances is provided. The points include data indicating geocoordinates of the geographic area. The latch assembly is engageable with an inner liner provided within a support post. Compositions used in methods for treating prostate cancer can also include or be administered with calcium ions, a nonionic surfactant, such as, for example, Triton X-100, and an antibiotic, such as, for example, gentamicin. At least some of the valves include a mechanism for sensing water flow and a regulator for adjusting the degree of opening of the valve until the actual flow corresponds to a selected flow value which is determined by a central control unit. Various embodiments of the apparatus have various components providing compatibility with most brands and types of televisions.