Patent ID: 7524424

Claim:
A method for treating a flow of fluid, the method comprising: providing a coil assembly in proximity to the flow; providing to the coil assembly an AC power source having a period including a first half-cycle of one polarity and a second half cycle of a polarity opposite to that of the first half-cycle; conducting current from the AC power source in a first loop comprising the AC power source, the coil assembly and a first switch during at least a portion of a first half-cycle of the AC power source period, and opening the first switch during a second half-cycle of the AC power source period; and during the second half-cycle of the AC power source period, performing a subroutine of producing a first large ringing pulse in the coil assembly wherein producing the first large ringing pulse in the coil assembly comprises closing and opening a second switch, the second switch being in a second loop with the coil assembly and, before the first large ringing pulse substantially decays, producing a second large ringing pulse in the coil assembly.