Take a look at my Eradicating CHC mold thread in pests and diseases- I had something similar happen.
Do you have access to brown listerine? You can pour that through the pot, or soak for a minute or so. Many people have as good success with that as physan as an antibacterial/fungal. Just as a pot soak/spray/pour, not something to presoak media in.
With my media, I soak for 24 hours, with rounds of boiling water the first few times to leach out some of the tannins that can stain the roots, and really get the media to absorb water more readily.
Some people will boil the media for 30 min- does the same thing faster, and kills some of the icky stuff (though not all, which is why you should also use physan.)
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