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The process burns away the volitile nasty stuff and bacteria, leaving cellulose, aka fiber and the carbon components of poo. Nothing there that can hurt you. I would have no issues using it, especially if that was the only game in town for cheap fuel...JJ
Our Base Camp shower at Dong Tam was usually pretty warm. Had a Pontoon on the roof of the shower, and all that Sun got it warm in a hurry & kept it there. Over 100° most of the time in the Delta.