Hi Annamarie,
Thank you for your suggestion. We will take that into consideration and see if there are any adjustments we can make.
For the time being, I would suggest filling up your tubs so that the water just reaches the copper bar, do not completely cover the copper bar. Once the client submerses his or her feet, then the water level should be high enough to cover the bar, but low enough so that the bubbles do not touch the under side of the top panel. I think about 2 and 1/4 inches of water should do it.
Let us know if that works for you. Again, thank you for your posting and participation in our forum!