What drains in the foot bath?

Hi,
I heard that any heavy metals in the foot baths are just coming from the blood, not the tissues where we really need to detox them. Does anyone know if all the toxins in the bath are just coming from the blood?

Some guy who specializes in heavy metal detox told me this - but he also had that arrogant wanna be know it all energy where nothing new could get in.
So I'm not trusting him and doing my own research.

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