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How do I know if my carbonating cylinder is empty?

There are a number of ways to tell when your carbonating cylinder is empty:  1. When you press the carbonating button you don't see any gas going into your bottle of water. 2. Even after repeated presses your water is not carbonated. 3. You hear a sputtering sound when you attempt carbonation. Pro-tip: SodaStream recommends keeping a back up carbonating cylinder handy so that when one cylinder runs out, you simply swap the empty cylinder for a full one. That way, you'll keep enjoying fresh, fizzy drinks without interruption and can exchange the empty carbonator via courier service or in a store near you. Take a look at <a href="https://support.sodastream.com/hc/en-us/articles/360018457914-How-do-I-know-when-I-am-out-of-gas">this video</a> to learn more!