The black humic acid granules in micronutrient products like big six, TM7 and cytoplus — they act as a natural chelator and carrier for the micronutrient load and settle out in water.
Jeremy explains that the granules settling to the bottom of your mix is expected — the micronutrients have already released into solution. You pour off the top and dump the humic dregs into one of your containers.
Discussed in: Ep 028