So: Savings + Ecology + Health = What more?
To read the other comments, I confess not to understand those who are unable to make bubbles (so to speak ...) because it's easy! It only tighten the bottle and then press loudly once or more depending on your preference of + or - bubbles ... (even a child can do it and it sparkles tremendously)
Then you gently lift the bottle by taking it from the bottom, and pulling it toward you before you unscrew, and you understand the "PSCHITTT" and you see the bubbles form in a white cloud ...
To receive advance bottles without ruining me, I recovered bottles of 1 liter of milk glass that I had (but it also works with bottles plastoc) and a funnel I decanted into water sparkling previously obtained ... it saves in sodastream bottles!
To swap recorded cartridges (that last still 60 liters!) Simply go to the site that I put in the comment. (Or in your hyper corner)
Syrups, it is similar, use syrups Trade (Teisseire or other SUGAR!) Because sodas are far too sweet and good morning blood sugar levels!
(FYI, there is the equivalent of 17 sugar cubes in a liter of Coke or any other soda not light ... So: Know the) Finally, thank you to the inventor of this ingenious archi Machine and very pretty (silver and black for me) which finally allows me to drink, I who swallow very hard water "flat"!