Foot Detox baths

Dear Doc,
Have you ever heard of the foot detox bath?

There are some Doctors who use this. You put your feet in the bath and it is suppose to draw out toxins. I had checked into this before and it cost $2,400 to buy the bath itself and found only 1 doctor in my area he was 80 miles away. I did not call to check out his prices yet. Would love to hear what you know about them first!
Thanks in advance,Raider