MagiCal can be used in both soil and hydroponic applications to supplement calcium (3.25%), magnesium (1.25%), and iron (0.11%). Added to the regular feeding schedule to promote healthy leaf growth. Magi Cal is also great for treating specific growth inhibiting nutrient deficiencies and improving fruit density and nutritional content. Unlike similar products this unique blend is completely water-soluable for immediate plant availability during each stage of development.