Nutrifield Premium Coco is pre- buffered to prevent Calcium and Magnesium lock out. The lock out causes Sodium and Potassium to be exchanged with Calcium and Magnesium during fertilizer application. The consequences result in a Calcium and Magnesium deficiency for your plants. The pre- buffering prevents this occurrence and also stabilizes the mediums pH while reducing the EC reading to less than 1mS/cm. Nutrifield Premium Coco’s physical attributes allow for large water absorption while ensuring the essential 30% air porosity is maintained.