This link makes it simple, scroll down: One tablespoon per gallon of water for the 800mg dose.There is 6.4 oz. or 181 gram to a package , the package says 6.4 oz. OR 181 grams mixed with 12.5 gal. of water gives a mix for 800 mg , so do the math. 181 g divided by 12.5 gal = 14.48 grams per gal. ONE LEVEL TEASPOON = 5 GRAMS { USE A MEASUREING SPOON } so the safe way to make sure you don't over dose is one level teaspoon to a halt gal of water or two level teaspoon to a gal. ---------that the dosage recommended by Durvet the makers of duramycin for 800 mg dose . That's the dosage I would use to make sure it killed any and all bacteria.. my little hens have been on this dosage for 5 days now and are doing good . one of my little hens was near death and today she was clucking and eating with the rest of them. So to sum it up -------- TWO LEVEL TEASPOON PER GAL.--------ONE LEVEL TEASPOON PER 1/2 GAL. AND 1/4 TEASPOON PER QT. =700 TO 800 MG DOSE Good luck
http://www.durvet.com/dl/Durvet-Poultry-Brochure.pdf