First attempt was a bit limp. I assumed a couple of hours in the fridge would be enough, but the temperature of the wine was 13 c. Cool, but hardly chilled. Ideally, the wine must be below 5 for optimum co2 retention. Fridge is designed to this, but 3 litres at room temperature is a lot of liquid to chill. Turn up the stat to max and leave overnight. Freezer is not an option. In a way, Sodastream accept this problem and sell ice poles which fit inside the bottles. You put them in the freezer, not the bottles.