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infraredz
source for this info?
infraredz, the high fecal coliform count has been well documented for the hot springs. The Forest Service has tested it. And think of it logically- all these soakers, whether nude or not, are going to have varying degrees of cleanliness emanating from their rectum. Even small particle size fecal matter will cause a problem. That's one reason why the Japanese have got it right- you have to shower and clean up before you enter an onsen (hot spring).
http://www.fs.usda.gov/recarea/sbnf/recreation/hiking/recarea/?recid=34152&actid=50