Grow Mediums Dont know if I have mold on my rockwool

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I was moving my clay pebbles around and I saw a white matter on my rockwool and pebbles a little bit sprayed a little water on it and it went away don't know if it was just from the water and nutes or mold
 
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Well when I washed it with water it went away so I guess it wasn't mold don't know if I still have it on there I would take a picture I guess if it comes back I will take a picture before I put water on it thanks for all your help
 
Hard to say without pics but I get similar build-ups on my Rockwool cubes and have put it down to salt deposits left behind from the hydro nutes. The girls remain healthy and happy - if they're happy then I'm happy.... :) :)
 
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