Found this article... http://www.npr.org/templates/story/s...toryId=5238296 doesn't answer about the actual chemical being dangerous, but the sewer gases coming up the pipes is what will hurt ya'. Gross.... anyone that has been near any raw sewage knows that smell will burn nose hairs an eyeballs right out of their sockets.
Ok maybe not that bad, but it's pretty disgusting. Unless you like that smell. Then you're just plain crazy.



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(open pit toilets anyone?) 

being put into the urinals is rather corrosive. Using water to flush dilutes that effluent during disposal, but with no water added it is very hard on the (required in commercial buildings) cast iron drain plumbing. It just sits there on the horizontal runs and concentrates through evaporation up the vent stack... 



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