Guest African Shaman Posted October 6, 2015 Share Posted October 6, 2015 Hey Fellow growers. If you don't know who Harley Smith is go find him on youtube. He is very informative and talks from actual experience and tests that he has conducted. He is a respected hydroponic grower and leading researcher worldwide. I have always enjoyed his videos and this one is most probably my favorite one. Lets spread the grow knowledge. Quote Link to comment Share on other sites More sharing options...
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