Abstract: A unit for removal and prevention of scale deposits in a preexisting fluid containing system and destruction of microbes. The invention utilizes a.c. and d.c. superimposed electrical fields in combination with a sonic or ultrasonic transducer for supplying electrical and mechanical energy into a colloidal or particulate-containing solution. An impure fluid stream of reduced conductivity is passed between a cylindrical insulated electrode, having a first end and a second end, which electrode is axially centered within an insulated cylindrical electrode and housing. The configuration of the electrodes form a sealed cylindrical treatment chamber, having a inlet and an outlet for a fluid stream, and provide an electric field of a.c. waveforms superimposed on d.c. waveforms, comprising a resultant ripple voltage waveform. The ripple voltage is obtained by rectifying and filtering a standard and commercially available a.c. voltage.