Yes,there are a few things that you have to be careful of
Firstly,make sure that you're really hydrated and go to the loo directly before the treatment,I always have an urgent desire to urinate when I'm in the foot bath LOL.
Secondly,you have to up your supplements afterwards because the machine not only removes nasty things from the body,unfortunately it takes some "good" minerals out,too.
Don't be alarmed if you feel worse afterwards,this soon passes.
And try not to be too shocked at the gunge which will leave your body
It is well and truly disgusting.
If you can,ask someone to take a very close look at the particles,the black stuff is heavy metals,the red stuff is debris from the blood and skin.
I really hope that it works for you,I love my ion footbath,I know that it's been instrumental in my very marked improvement.
Hope this helps if you want to know anything else,ask away
Tickled