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Adding CO2 to the aquarium can be complicated, but with the right accessories it becomes relatively easy. Also when you need to attach multiple aquariums to one system, you can find everything you need here.
Fill the Sodastream bottles yourself with CO2 from a larger CO2 bottle with this coupling piece. The economical solution to use CO2 for the Sodastream. With the adapter, the Sodastream cartridges can be filled in no time.