About this item ORGANIC CALMAG FOR ALL PLANTS: Organic Calcium, magnesium, and micronutrients micro-chelated with Organic Acids for bio-availability. PREVENTS COMMON GROWTH DEFICIENCES: Apply CalMag in every stage of growth for strong stalk and leaf health. Use at 1-2mL per gallon. COMPATIBLE WITH OTHER NUTRIENTS: 100% Compatible with other nutrient systems, and can actually help make other minerals more Bio-Available. HIGHEST QUALITY, MOST POTENT, BEST VALUE, BIGGEST YIELD: TPS’s ingredients are better for plants, better for you, and better for the planet. Simply the best choice for the conscientious grower. FORMULATED AND MADE IN THE USA: Designed by sustainability conscious plant scientists and craft growing enthusiasts in Seattle, WA. TPS chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best nutrient systems.