Hy-Pro Cal-Mag provides a precise balance and optimal ratios of the calcium, magnesium, and iron that are critical throughout all stages of growth, especially in heavily fruiting plants and fast blooming annuals. The high level of Calcium and Magnesium in our formula improves the strength of cell walls and the production of chlorophyll.
Hy-Pro Cal-MAG is vital for soft water areas where tap water contains little or no calcium or magnesium. Hy-Pro Cal-Mag is also fortified with a proprietary blend of select trace minerals to help maximize yields in fruiting and flowering plant varieties. Iron for example acts as a catalyst for essential reactions within the plant, especially related to metabolism.
It has to be the right form of chelated iron. And it has to be in the correct ratios, in relationship with the other nutrients in your reservoir.