An aqueous-based coolant for cooling and reducing corrosion potential in applications having high aluminum or nickel surface area to coolant volume ratios has a pH between 8 and 9 and includes about 35 weight % to about 65 weight % propylene glycol, about 1. The filter comprises a plurality of metal layers and a plurality of dielectric layers arranged in a vertically-stacked topology. A remotely located individual \u201clogs in\u201d to the remote office platform and, once the individual is authenticated, PBX-like communication with the mobile device is established. Threads are located on an outer surface of the upper end portion and surround the inlet. Due to the geometry and the tips, the electric field is concentrated and amplified at the field emission surface.