So I've been fighting this problem for about 2 and a half weeks started at the bottom and has now worked its way up to the top fan leaves and to no avail have i made any progress I've been watering with 5ml of calmag per gallon and still showing signs of a deficiency. Also been feeding with maxigro between 600-800 ppm every other watering. Ph of the water has been between 6.2 and 6.5.
Rubbed your 2 cents together and out popped nothing Just checked my water with the meter and liquid tester and they were the same. Checked my run off which was over 7. In turn that is what is causing the lockout. The soil ph being too high. The meter was not wrong.