Also, I have a SodaStream and would not buy it again. Not that it's a bad product, but the soda flavors aren't quite as good as the stuff on the shelf, and you don't actually carbonate flavored drinks, you only carbonate water and then add the syrup, so you might as well save $80 and just buy the bottled fizzy water and buy the little syrup containers if you like the flavor, instead of buying a SodaStream + syrup containers + CO2 cartridges. Or, you know, just buy the soda, because you're going to have to buy the syrup containers anyway. I'd be curious to see what the actual cost savings would be...
I went against the instructions and tried carbonating grape juice once. Let's just say my counters are still stained purple :awe: