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When I lived in Los Angeles, I bought a small RO system for my orchids. I didn't know the specific TDS, but looking at any shower head, I could tell it wasn't good. Upon moving to Portland, OR, I continued to use the slow RO system out of habit. Recently, I purchased and TDS and ph meter and...

Hey All After a few years of growing, I'm trying to get more scientific, or at least specific, with the purchase of TDS and ph meter....both cheap. My first question. Is there a specific water ph that works for all species and hybrids or do the species vary? If so, is there a definitive list...

So I'm new here - and returning to orchids after an 11 year hiatus - I used to have about 300 orchids of all sorts grown under lights in the Chicago area. Then my daughter came along and orchid time was gone. The collection was gifted, sold or passed on.:( 11 years, 3 moves and one preteen...