Sulfur...it happens when water sits too long...it rots. Drain it or run water through it often. Now you need to clean it out with bleach or something. It's probably coated with black slim on the interior surfaces.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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