citric acid works well........ if you water right away. However, it does not maintain ph over time sitting in a container or res. I tried using food grade citric in an auto pot res and withing 24 hours my ph crept up from 6.5 to 7.1. I went back to standard ph up, phosphoric acid. but if you mix and use right away it works fine.
Do you recommend that over regular ph down?
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