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!
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.
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.
It’s always good to accurately calibrate a lens to do above 7 solution and a below 7 solution