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For Mr. Hall to do his three-hour Tablo treatment, he connects one needle to an arterial line to move the blood through the machine’s dialyzer, also known as an artificial kidney.

With hemodialysis, the blood is removed from the body and cleaned in a dialyzer, or artificial kidney, before being returned.

With hemodialysis, machines filter the blood outside the body via a dialyzer — essentially an artificial kidney — and return it to the body.

For four hours, my polluted blood supply would be siphoned out through a catheter jammed into my femoral artery, pushed through a dialyzer, and returned to me.

Here I have a tested dialyzer in which has been placed a half cubic centimeter of pure clear serum.