We are finding the ionic foot detox with the feet in separate containers works much faster than with both feet in the same tub. Any fully DC offset frequency source (pulsed DC) can be used for this. Frequency generators like the F-Scan, F165 or any function generator can be used. The GB-4000, Astropulse, BioSolutions and Global Wellness, BioSolutions and other equipment that produces alternating current require a diode in the circuit for foot detox purposes.
The voltage should be just high enough to be felt. Most any frequency can be used, but most people have used frequencies below 10000 Hz.
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In short any zapper can be used for this, download the document for an image hooked to a battery for those without zappers...