About the accuracy of those PH drops ...
New, calibrated Oakton PH meter reads 5.7 after adjusting PH of well water. My tired, lame old Gen. Hydro. test drops look like about a 5 ph color to me. When I set the PH to about 6 according to the drops the meter reads about 6.7.
Have I been feeding at 6.7 ph? Yikes!
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