Why does the CO2 gas quantity in Sodastream cartridges differ in different nations? [closed]








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Just was looking at the $\ce{CO2}$ cartridge for the Sodastream soda / seltzer maker I was planning on buying and this bit of info caught my eye:  

Any idea why they may want to pack $\pu{25 g}$ less $\ce{CO2}$ for South Africa? Is it some regulatory issue? Marketing gimmick? 
Or more interestingly, some technical factor? 


[![enter image description here](https://i.stack.imgur.com/swI4T.png)](https://i.stack.imgur.com/swI4T.png)
[![enter image description here](https://i.stack.imgur.com/AntZL.png)](https://i.stack.imgur.com/AntZL.png)


