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Old April 19, 2016   #12
Join Date: Apr 2008
Location: California Central Valley
Posts: 2,479

The unpleasant odor can indicate that he's adding stinky stuff, but in general, stinky compost is compost that has gone anaerobic. It needs to be aired out, and dried out. If it were your own compost, you could do this by turning it and adding more "browns" as you went. Browns are mulch, newspapers, straw, autumn leaves, etc. The stinky odor can mean the browns and greens were not balanced -- excess greens make a stinky mess -- or it could even mean that he's just adding "greens" (kitchen waste, green leaves, grass clippings, coffee grounds, etc) without covering them up.
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