Where does the black sludge in a sealed system come from?
Where does black sludge come from/what is it?
- Thread starter AndyT68
- Start date
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Its called magnetite, which is effectively rust coming from the ferrous parts of your heating system. Its black rather than the usual brown / orange colour because its lacking an oxygen molecule. (if 'O' level chemistry serves 
)
John
)John
DIYnot Local
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