Star-San is diluted 1 fl/ 5 gal water. For me that is a lot of working strength sanitizer. I bought the smaller 8 oz bottle and lasts a long time, and here is what I do.
1 fl = 29.57353 ml so 1 gallon need 1/5 of this amount 29.57373/5 = 5.9147 ml. Round to 6 ml for the sake of convenience...
