Why does the footbath water turn black in color?
The surface properties of the array are optimized to keep the array functioning at peak efficiency during its service life. Research proved that this could be accomplished by allowing the array to emit a steady stream of very pure iron oxide-suspended particles into the water, while the current passes through. Such particles are quite biologically inert and can easily be washed off the feet at the end of the footbath session with the Zen Spritzer. However, they ensure that the surface of the plates doe not acquire any undue contamination that would decrease the effectiveness of the bath.
