For info on the effectiveness of saunas, check out Dr. Sherry Rogers -- just type in her name on the net. She has data on what is "sweated out" and she says that saunas are the best way to detox mercury and nearly all other poisons we are subjected to in this toxic world. One of her books is called "Detoxify or Die" and she talks a lot about the infrared saunas in that book.