Cal-MaxDEFICIENCY CORRECTION Cal Max works to charge soilless media and bring plants back from common minor nutrient deficiencies resulting from nutrient imbalance, rapid growth, or overly humid conditions. A must for growers using coir based soils. Available nitrogen fuels chlorophyll and protein production to quickly re green starved plants. Chelated iron adds more deficiency fighting power for lush green growth. Added calcium helps to improve plant vigor