You were spot on, on this tip. Got my 7.0 solution, calibrated it. What I found out was I was using about 4 tablespoons vinegar per gallon of water to balance PH, when calibrating with 4.0 solution. Now I find that I need like 1 tbsp vinegar to get it balanced. So then calibration between 4.0 and 7.0 is astounding. Hopefully this helps my problem some. Thanks!
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you are very welcome, you can buy the ph up and down off eBay lot easier to work with. Very inexpensive. Good luck with your grow.
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Update, Did the flushing, found out I had a PH tester issue. Got new 7.0 calibration solution, and what I was watering with ended up being very low PH. I corrected what I was doing with the new calibration solution and Wow. I went from adding 4 teaspoons of vinegar to using only 3/4 of a teaspoon. Very important to be watering with the correct PH.
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It’s always good to accurately calibrate a lens to do above 7 solution and a below 7 solution