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Hydrogen Sulfide

[H2S]

A corrosive and flammable gas often found dissolved in well water and often accompanied by iron and low pH values.

Hydrogen sulfide develops from decaying organic matter, from sulfate-reducing bacteria, and from petroleum refining. H2S formation can be catalyzed by a magnesium anode rod in a hot water heater. A very disagreeable "rotten egg" odor is evidence of the presence of hydrogen sulfide.