White fluff on rock wool and other questions. Help! : r/Hydroponics
About-UPuper®-rockwool cubes,grow slabs
White fluff on rock wool and other questions. Help! : r/Hydroponics
hydro grow forming white mold?
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What is this white mold on the rockwool? : r/Hydroponics
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What are these white specs in rock wool? I'm terrified it's a pest (using Gardyn system) : r/Hydroponics
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