used rockwool

[mitchell]

The last time I used rockwool was about 8 months ago and when I stopped, there were a few black
patches that looked like fungus or mold on the top. When I was done with my first batch of
habaneras and green peppers, I let the rockwool air dry and am now concerned that mold or fungus
may grow and destroy any chances of my second crop.

Can you re-use rockwool after its been dormant and if so do I need to be concerned about potential
mold problems?