Methods and apparatuses are disclosed including a method of neutralizing charges of solid contaminants and weakening cell walls and membranes of biological contaminants in a fluid, comprising the steps of: establishing a flow of a fluid through a fluid treatment chamber surrounded by a sidewall of a fluid treatment vessel shaped as a conduit having a fluid input port, and a fluid output port, the sidewall constructed of a shielding material; and energizing a coil of at least one antenna within the fluid treatment chamber with at least one electrical energizing unit to produce pulsed radiation within the fluid treatment chamber to treat the flow of the fluid therein, wherein the sidewall of the fluid treatment vessel establishes a chamber having a capacity to restrict propagation of the pulsed radiation out of the fluid treatment vessel.