An activated carbon, disclosed as useful in purification and decolorization of hydrocarbon fuel, particularly gasoline, is characterized by inclusion therein of polymerized phosphoric acid or reduced transition metals. The voltage controlled oscillator also includes a set of control elements where each control element within the set of control elements has an input connected to an input of a delay element within the set of delay elements and an output connected to an output of a different delay element within the plurality of delay elements. The control and display units and the therapy module or therapy modules are connected to one another via bidirectional communications connections. The integrating units respectively compute first and second integration values by integrating corrected color components. When the at least one bracket is tightened a compressive force holding the electronic module body section in place is imparted between the flange, the control panel wall and the at least one bracket. The system reduces manufacturing costs, simplifies storage and shipping and improves assembly efficiencies.