Unlike Phrags, I don't think that Paphs are all that sensitive to water quality. Many grow on limestone cliffs. People who live in pure-water areas add marble chips or dolomite lime as top dressing to add calcium and raise pH. I do know that at the Huntington Botanical Garden in southern California, with a very significant Paph collection (one of the largest in the US), that they use well water (which ranges from 200-800 ppm TDS, primarily calcium bicarbonate) for the Paphs. They have plenty of RO water capacity, which is used for the rain-forest plants and anything else that needs it (resources are not an issue) Most of the Paphs clearly are quite happy with the high-TDS, high pH water.
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