What is the difference with this product (https://www.galaxus.ch/de/s2/product/sodastream-crystal-wassersprudler-6189003?gclid=EAIaIQobChMIz6GJr82q9QIVAevtCh1awQ99EAQYCSABEgJBrPD_BwE&gclsrc=aw.ds)? Once 2.0, once no add-on. Visually, however, the two devices look the same to me.
