I like the MSU stuff and my water is pure enough that the pH did chech between 5.8 and 6.2 per Dr Argo's articles on the subject I used the RO water mix. Got complacent about checking the pH dropped (My well varies during the year according to rainfall) and I killed a lot of roots before I checked again. Its best to spot check pH every so often. I use 17-5-17 Cal Mag now and do adjust pH slightly. If you feel OK not doing it then thats fine but it is very easy to check and adjust. Orchids are grown in all kinds of water - understand a grower in St Barbera grows with water that has 1800 ppm TDS. Mine checks 300 ppm contaminates but once grew orchids in Calif. A lot depends on what the contaminates are so the discussion that some things can or cant be done is all believeable. It just so easy and so productive to check and control pH.
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