SepticTanks
ThoughtStorms Wiki
Don't laugh ;-)
I find septic tanks very interesting : a fascinating
combination of chemistry, ecology and hydraulic engineering.
http://www.septic-info.com/doc/catlist/septicbasics/home.html
Not to be confused with ScepticTanks
Ah; Then you may be interested in [the http://www.worldtoilet.org/ the World Toilet Organization..!]
See also :
CategoryDecentralizedLiving, CategoryEcology
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