I bought this from Argos as it was cheaper. It is a waste of money. The instructions were reduced to a single page of pictures (which shows what sodastream think of customers once they have your money). I looked up instructions on the web which state that 3 firm presses will produce a loud buzz which is the first level of carbonation. Three presses produced water that was as flat as it was when it went in! It took 20 firm presses to produce anything like fizzy water and still no loud buzz. I suggest you get an old fashioned soda siphon half the price and it will work!
CraigSodaStream Jet Megapack - 2270055
SodaStream Jet Megapack - 2270055
Specifications:
bottiglie1 GASATORE JET, 2 bottles in pet's 1lt, 2 bottles in pet 0,5Lt, 1 cylinder with licence use containing CO2 80 Liter