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Carbon will not cause dust. I have a dry sump system with 3 carbon filters in it 2 foam filters and have never seen dust.0morrokh said:Another thought, are you using carbon in your filter, and if so did you rinse it reeeeally well? I don't bother with the stuff anymore unless removing meds, but when I used to use it, no matter how carefully I rinsed it, it would leave some dust on the surface when I turned my filter back on. It always cleared up in a day or 2, though.