I'd agree with Ray on not worrying about the water. In fact, a lot of Paphs really like calcium, coming from environments where they grow on limestone. Some people who use pure water use limestone chips or dolomite lime as a top dressing. But plain ol' tap water would accomplish the same thing painlessly. According to the manager of the very large orchid collection at the Huntington Botanical Gardens, most of the Paphs get well water (range from 200 - 800 ppm TDS, heavy on the calcium carbonate), they use RO for the mounted rain forest plants, etc. (they have whatever resources they need, so don't need to compromise) So I would not worry about hard water on the Paphs.
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