I would like help on knowing how much Sod. Benzoate powder and citric acid powder to used to make a gallon of syrup. or add to a 5-gallon syrup to preserve it. I recently purchased 50 lbs of Sod. Benzoate powder and citric acid powder to make syrup but I am not sure of how much to add to each 5-gallon syrup container. help if you know how many teaspoon or tablespoon to used.