I got a 1 gallon keg to play with some force carbonating. I figured it would be easier and cleaner to give this a test run with water. I did the whole pre-chilling, shaking, rocking, rolling thing to get a head start and then let the keg sit in the fridge for a day. Tried it today, it's very very lightly carbonated. I'll let it sit longer, not a big deal. But what I don't get is how a Sodastream can blast CO2 into some water and it's ready to go in 5 seconds. What is the difference?