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How much Fermaid-O do you need? The amount of required nutrient addition is based on your starting gravity. For an easier calculation convert to Brix and figure out your target mg of nitrogen per liter using the following as a starting point: 21°Bx = 200 mg N/L 23°Bx = 250 mg N/L 25°Bx = 300 mg N/L 27°Bx = 350 mg N/L 1g/gal of Fermaid-O = 50ppm (or mg) ...



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