How to mix Star San in small amounts.
1 gal of water use 0.2 oz of star san which is equal to 5.91mL
1/2 gal of water use 0.1 oz of star san is equal to 2.95mL
1/4 gal of water use 0.05 oz of star san is equal to 1.47mL
I use ml since we have a lot of Medicine dropper in my house.