You shouldnt have to change anything. The only differenbce is that you are mixing up twice as much VOLUME of solution, but the dilution is the same. For instance, when I use my 1 pint tank, I mix 1/2 Oz of syrup to 15 1/2 Oz of water, and when I use the larger tank I mix 1 Oz to 31 Oz. The strength of the dilution stays the same. If you start changing the dilutions, you will run into strange results.(posted 8898 days ago)The rule of thumb for fixing is twice the time it takes the milkiness to clear.