Questions about any nutrient brand or feeding strategy not covered by brand-specific subcategories. EC/PPM, pH, deficiency diagnosis, and feeding schedules.
Anything tied to one brand has its own sub-board under Fertilizers; what collects here is the part that stays true across all of them, which is most of the diagnosis. Post the numbers with the question, meaning source water, input solution and runoff or reservoir, because a nutrient that is present but locked out by pH looks exactly like a nutrient that is absent. Say which substrate you are in as well, since peat, coco coir and a recirculating system each punish a different mistake.