43 grams to do it would have to be weighed by a scale. If you need a break down there's 28 grams in a ounce 16 ounces in a 1 lbs 448 Grams in a pound. I just put some in a guess and keep checking. But measuring the first time isnt a bad idea. What salinty does 43 grams come.out to hopefully 1.025 or 1.026