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RAW Calcium/Mag contains 15% calcium and 3% magnesium. RAW Calcium/Mag has optimized the ratio of each element in a water soluble formulation of calcium nitrate and magnesium sulfate so that it doesn’t leave the media salty. This product is a standalone calcium/magnesium supplement. Do to its low dilution rates a little RAW Calcium/Mag goes a long way. It's also ideal for preventing deficiencies, treating deficiencies and for creating optimal recipe solutions. Works in conjunction with all nutrient and feeding programs.