I live in the tap water is very hard, has a pH around 8.0 and with the addition of chlorine, not only unusable x orchids, but also the x most plants.
What you read is true, many prag not like alkaline or sweet water (osmosis), in particular the Paph. bellatulum, for these I raise the pH to 7.0, the ideal would be the rainwater corrected to necessity, but finding the required amount is impossible for me, so I have to use the reverse osmosis water suitably enriched with various salts, proceedings now tested and used for years, also I add to the bark intended to Paph. of CaCO3 (calcium carbonate) and / or crushed seashells, for some pragmipedium, Phragmipedium kovachii add the type of limestone.






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