SUPERIOR CAL-MAG - ENVY's CalMag+ is derived from a superior source of Ca, Calcium Nitrate. Most CalMag blends you will find are created by blending Calcium Chloride, which is less friendly for plants and hydro systems PERFECT FOR R.O. - Formulated to replace minerals depleted by reverse osmosis water applications. While R.O. water offers consumers unparalleled purity, it strips minerals necessary for plant growth - ENVY's CalMag+ Fe replenishes water stripped of minerals. PREVENTS BLOSSOM END ROT - our CalMag+ Fe provides Tomatoes, Peppers and other hydroponically grown crops an ample concentration of highly-absorbable Calcium, preventing Calcium Deficiency which causes leaf yellowing & blossom end rot in Tomatoes and Peppers CORRECTS COIR NUTRIENT LOCK UP - coco-coir is a popular growing media for hobbyist and professional gardeners alike. While it performs well, essential nutrients become locked up in its fibers. Our concentrated CalMag+ replenishes nutrients lost to lock-up BETTER TOGETHER - our CalMag+ Fe performs excellently with all hydroponic, soil and coir nutrient lines as a supplementary Calcium, Magnesium and Iron source - however; it performs best when combined with ENVY's A & B base nutrients. ENVY Cal Mag + Fe Because not all CalMag is Created Equal: When you think of Calcium and Magnesium supplementation for your plants; you either thing of healthy, vibrant green leaves - or of the deficiencies evidenced by yellowing between leaf veins as chlorophyll degrades and production slows. Nobody wants that! What people don't think often is: "Where does my Calcium come from?" While most CalMag available today is sourced from Calcium Chloride; at ENVY, our CalMag+ is blended from the superior source of Ca, Calcium Nitrate. We further complement this superior Calcium source with the use of Chelated Iron (Fe) DPTA & water soluble magnesium, because availability and uptake are more critical than content percentages alone. Through the use of ENVY's superior CalMag formulation; you will maximize the availability, quality and net uptake of these three critically important nutrients that are necessary for the continued health and growth of your plants.