Quote:
Originally Posted by WaterWitchin
Yep... 400 ppm is way better than mine. My pH runs about the same. And so far the only thing I must use R/O on are paphs, phrags, a psychopsis and a bulbo. I've heard must use R/O on Tolumnia, and just the opposite. Have gone both ways. Can't tell the difference.
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You might reconsider for the Paphs, depending on what is causing your high TDS... at the Huntington Botanic Gardens in southern California, they use well water that ranges from 200-800 ppm (unpredictably, more often on the high side of the range) on their world-class Paph collection. In an article in Orchid Digest, Brandon Tam, their orchid specialist, states that they have tried it both ways and the Paphs actually do better with the well water than with RO. Now, the solids in their water are mostly calcium carbonate. If you had high sodium that would be a different story entirely.
Phrags, on the other hand, definitely do need good water.
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