Using our cylinders outside of SodaStream is not a good idea. 

SodaStream only warrants the safety of cylinders refilled by us and used with a SodaStream Sparkling Water Maker. SodaStream is not responsible for products of any other company or brand, which may damage the cylinder or Sparkling Water Maker. Such damage resulting from use of third party products is not covered by the Sparkling Water Maker Warranty.