Although this foot bath is popular with health practitioners and they get positive results with it, the challenge in the commercial setting with this bath is the cost per footbath session and how tedious replacing the metal array can be. They are small very thin steel washer discs.
The other therapeutic design drawback is that the positive and negative array is stacked so cancels a lot of the potential pure negative polarity field that could have been created….So even if it is a 3-5amp footbath the array can also reduce the polarity field and thus therapeutic effects achievable.
Consider the Dtox monster and how that array is shaped to maximize the negative polarity field as well as the ease to replace the long thick steal plates.