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Your looking to dilute Phosphoric Acid and pour it into your growing medium to lower the pH? Why not go for other easier remedies? I have a list of them in the guide in my sig. As for obtaining Phosphoric Acid, I believe it is done commercially by either adding sulfuric acid to Calcium Phosphate, or by burning pure Phosphor to produce Phosphorus Pentoxide which is then dissolved in diluted Phosphoric Acid. The last method makes it very pure.
(Sources = Wikipedia.org)
Good luck with that.
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