Sounds similar to something I read about walking barefoot on the beach/ surf, kind of along the lines of positive/negative ions and such...
That was how i came across that information - I was looking for info on pos/neg ions.

I wish I had bookmarked that info..
walking barefoot on the beach/surf supposedly is very good for the body in a ionic cleansing/balancing way.
Something to do with the natural sea salts and the motion of the surf and being barefoot.

If you read about those ionic cleanse machines some of those sites have the theory about how it works..
I know the machines may or may not be a bit of a scam, but walking in the surf if you are near the ocean is free and mentally calming too.