The Grow Awards 2026 🏆 
White substance appearing on air tube. Anything to worry about?
Hempy_The_Kidanswered grow question 3y ago
Hard water calcium build-up. Should be fine unless you want to add filters on your water source.
Organomananswered grow question 3y ago
Correct, just dried out nutrient salts/calcium due to evaporation.
Nothing to worry over.
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