I guess it will be ok to use citric acid ! I`m using Nitric Acid because it`s very easy to get ( Any hydroponic store ) and quite concentrated ! that way, I just need to add 1 ML of nitric acid 12 % to 1 gallon of water ( Tap water ) to bring down the PH to 5.6.
Fo distilled water of RO water, I use between 0.2 to 0.5 ML of nitric acid. Because citric acid is less concentrate, you will need to add more... I guess !
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