Grotek Cal Max, 10 LiterGrotek Cal Max is amazing for amending coco coir based media, with fast acting nitrogen and a strong calcium source to assist in buffering coirs inherent imbalance. 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