I would check the PH of the run off just to make sure things are in range if you have a meter. I mixed up 1 teaspoon of cal/mag, 1 teaspoon of tiger bloom and 2 teaspoons of grow big in a gallon the other day and checked the PH and it was way low. I had to add 2 teaspoons of potassium silicate which brought it up to 7.2 PH