Enclosed is the corresponding help from SodaStream. :) https://sodastream.ch/flaschen-kompatibilitaet/

Since the lid has a rubber seal inside, I would advise against cleaning it in the dishwasher. We always clean them "only" with hot water and then rub them dry well. Drying is the most important thing. Always keep the lids separate. Do not close the empty bottle with them. (Then you won't have any "funny" smells).

Yes, you are right, it is a duopack and we will process this as quickly as possible.

Glass carafes are only compatible with SodaStream DUO and Crystal.

I found the answer in another thread saying that the two products are not compatible....

I don't think the glass bottles work for the Spirit.

No. The supplier argues with safety. Glas bottles must be better protected while filling

No, unfortunately the Sodastream glass bottles do not fit the Aarke. According to the manufacturer's FAQ, glass is not possible because, for safety reasons (glass bottles shatter differently than plastic), a jacket would be needed for glass bottles. The glass carafe from Sodastream is clearly more beautiful than the plastic bottles, but Aarke is more beautiful for the appliances, so unfortunately the two do not go together.

Since we purchase the two items from different suppliers, the purchasing conditions are also different. Here it is effectively the case that we get the double pack cheaper and can pass this price advantage on to our customers.

That has been cleared up. Those who read have a clear advantage...