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Old 06-08-2011, 05:21 PM   #3
Seasoned Camper
Join Date: Oct 2009
Location: Plainwell
Posts: 99
M.O.C. #9822
Or it could be manganese flakes letting loose from CG piping. Happens in my stick house once in a while and looks like pepper. Manganese is not regulated as a health risk, but can cause odors - and black stuff in the fixtures.
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