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iv been using silicon but could never find a recommended dose for folier spraying. I use 1ml in 1l of milk/water with few drops of h202. I think air circulation has been my problem. I now think could I get another fan in there as opposed to could I get away with one less. Will sealed room...

Hi all Quick question How long can powdery mildew exist in grow space without any living plant material. ? For example, growroom cleared and left unused.? My cleaning between grows has obviously not been up to scratch