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    Powdery mildew around carbon filter, not on plants

    I understand, just had no idea what else it could be.
  2. W

    Powdery mildew around carbon filter, not on plants

    For what it's worth, thank you for bumping this post, I'm sure it's the only reason I found it on Google search lol. Completely green to growing, this white powder has been freaking me out assuming its PM but was never on the plants, just the walls, fans, carbon filter sock etc. Really glad to...
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