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. RAW Calcium/Mag is a stand alone Calcium/Mag supplement. Due to its low dilution rates a little RAW Calcium/Mag goes a long ways. It is ideal for preventing deficiencies, treating deficiencies and for creating optimal recipe solutions. A 2 oz package of RAW Calcium/Mag makes up to 200 gallons, an 8 oz package makes up to 800 gallons and a 2 lb package makes up to 3200 gallons.