1. Make sure the cylinder is properly inserted in the cylinder holder, with the pink cylinder handle lowered.
2. Push the carbonating lever and check if you see gas entering the bottle. Make sure to push and release in one-second presses, no more than three times.
3. Push the lever a few times and check for bubbles.
4. Listen for a sputtering sound when you push the lever.
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Pro-tip: SodaStream recommends keeping a back-up carbonating cylinder handy so you can keep enjoying fresh, fizzy drinks without interruption while you exchange the empty carbonator via courier service or in a store near you.