The present invention relates, in general, to methods for removing viral contaminants from therapeutic protein solutions to improve safety of therapeutic proteins administered to patients. The clip is releasably attached to the syringe, and a holder connected to the clip releasably receives the motor. The cathodic wall has an upwardly-oriented inclined face that forms a sloping upper aluminium-wettable drained active cathode surface on which aluminium is produced and drains into the aluminium pool, and a downwardly-oriented inclined face which is in contact with the molten electrolyte and which overlies the aluminium pool. The voltage regulation is achieved through speed and load coordination that is based on a machine reactance specially selected and calculated to achieve compensation between the external voltage variation and the internal machine voltage drop, resulting in substantial savings in electronics hardware. First and second laterally spaced cross members extend between the second legs along the rear face of the first seat. A battery is snuggly disposed in the center compartment.