Ive been using it this run. It's my first time using Jack's 321 as well as this. so, I don't know how much this is helping, but charging along with no calcium or magnesium issues. Read an article from IC Mag (i think it was that) that popped up when I searched no nitrogen cal mag or Jacks.
Started lower, but now running Jacks part A at 2.25 grms, epsom at .875, and Cal/Nitrate at 1.5 grms per gallon.
50 PPM of this product starting at flower
2 ml Mr. Fulvic
RAW silica, and kelp at .1 grms
Also 2.5 ml SLF
Comes out to 1.5 EC on the blue lab meter with my water. Should have probably put it in a nutrient calculator, but never used one. Why do that when you can fly blind right!!!???