"...The idea of the Purification Rundown, or 'Purif', was that a person could get rid of residual toxins and poisons from chemicals or drugs in his body by intense sauna treatments. The basic routine was to ingest a bunch of minerals and vitamins, run for thirty minutes, then sit in a sauna set at 160 degrees for five hours a day, with occasional breaks. The point was the first step on LRH's Bridge to Total Freedom."
Or you just die. Because no, bodies aren't full of toxins. And no, you should never sit in a sauna for that long on any given day, even with breaks. Did Hubbard actually do any of the shit he implemented? I don't think so.