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This is a discussion on Well Water and orchids within the New Growers: Ask the Senior Members forums, part of the New Growers category; Citric acid should also be fine but one cannot predict its buffering capacity and also ...
Citric acid should also be fine but one cannot predict its buffering capacity and also how it will react with the chemicals in the fertilizer. As Michael mentions, the pH paper strips from Aquarium stores will be your pest buy.