I found an article entitled "Growing Orchids in Atlanta" which was put out by the Atlanta Orchid Society. In the article it said, "...in Atlanta, water contains very low levels of salt, just barely above what is found in rainwater. The EC measurement of Atlanta water is usually less than 0.1 mS/cm." The question is whether I should use the MSU fertilizer for RO or the MSU for fertilizer tap water.
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