Doctor told him to walk in the pool to release bodily toxins

[poolswimmer]

I belong to the YMCA. Was in the smaller pool. The water is warmer in that pool, that's about it. A YMCA member was reporting he has kidney disease and his doctor told him to walk in the pool because it will release the toxins out of his body right into the water. And to keep walking for 2 hours to release toxins. I see this man there every time I go and I found out tonight that he walks in the small pool 2 hours a day. My question is, if someone has kidney disease and is using the pool to walk in so he can release toxins from his body, that scares me for the rest of us. Now I don't want to go back into the pool. Is this dangerous?

[Teapot]

I am not a doctor but any toxins would be passed to his bladder via normal metabolism so make sure he goes to pee during this two hour regime and NOT in the pool! Any sweated out would be via urea same as anyone else and the water treatment should oxidise most contaminants. Depending what treatment they use (ozone/UV) + chlorine depends on how much gets broken down.
Can't be any worse than having someone cough or sneeze over you.