I fill up my SodaStream with bottles from AGA here in Denmark (they have a "get the 6th one free" special so the effective refill cost is about 15 USD). There's

I fill up my SodaStream with bottles from AGA here in Denmark (they have a "get the 6th one free" special so the effective refill cost is about 15 USD). There's also this system: http://www.wassermaxx.com/ http://www.wassermaxx.com/ -- again compatible. Perhaps SodaStream etc. is more popular here in Europe as we don't drive quite that much in cars. I'm sure I drink 20-30l of carbonated water per week; I wouldn't want to have to carry that home from the shop every week and return the empty bottles the next week. Except making my water fizzy, AGA's CO2 production is apparently used to extinguish exotic fires. There's a particular type of compressed wood pellets used in heating power plants here, that wood is stored in large silos which apparently can catch fire internally. They spent 2 weeks trying to slowly extinguish this fire using 170 ton of CO2 shipped by trucks from AGA (equivalent to 400,000 SodaStream compatible containers).