So, to sanitize my 6.5 gal. carboy I only need a quart of water? How much starsan do you add?
I mix mine in 1 gallon increments: 6ml (0.2oz) StarSan to 1 gallon water and I measure that with a small syringe (I think you can get them at the pharmacy). I like mixing 1 gallon at a time because I can just dump it back in a gallon jug when done for storage. Hope this helps.