The Copper Tub used for OPTIMUM ionic detox foot bath ion spa treatments. The copper acts as an additional conductor thereby making the detox ionic cleanse foot bath treatments all that more powerful. The tub is handmade and 100% pure copper, no binding components such as Beryllium is added (no green tarnish will appear due to this). The tub is customized for the footbath session such as all feet sizes, handles for easy carrying, a line to indicate optimum water level. Expect to get more life out of your OPTIMIZER water array due to the conductivity of the copper so less current is ran from the unit to achieve the same AMPs. We do suggest some form of lining to prevent eventual wearing of the copper due to the charged saline solution of the footbath water. A drawstring trash bag can be used. (note: lining does not affect the conductivity & there is no leakage of plastic toxins due to osmosis environment & boiling point is needed to break down plastic components).