Sodastream Easy vs Duo vs Crystal 2.0 & Sugar-free Syrups: Everything you need to know - YouTube
SodaStream Crystal - buy at Galaxus
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Crystal Home Sparkling Water Maker Starter Kit - Walmart.com
SodaStream Crystal Sparkling Water Maker Machine with 600 ml Reusable Glass Carafe for Carbonating and 60 L CO2 Gas Cylinder - Crystal Machine Only Compatible with Glass Carafe Bottle - Black :