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That is wild. I’m on well water (300 ft well) and my ph runs 7.5-8.0. I use 2 teaspoons of pH down for 5 gal of water. It gets me to 6.5. I’ve done it so many times I don’t even “pH pen” it anymore. Once I got the pH right, my grows have been much healthier. Lots of genius help in here. Peace. Side bar: I’m using 3gal auto pots in my setup.