COMPATIBILITY: Each machine is compatible with a specific Co2 cylinder: either the Classic screw-in system or the Quick Connect system. Our advanced one-click Quick Connect Co2 system is compatible with Terra, ART, Aqua Fizz, E-Terra, E-Duo & Gaia. WHY CHOOSE SODASTREAM: Each SodaStream Co2 cylinder is filled with 100% Food Grade Co2 and undergoes triple quality control checks where they are cleaned, filled and sealed. HOW LONG WILL IT LAST: Each cylinder makes up to 60 liters of sparkling water (upto 71 SodaStream bottles), depending on carbonation level and sparkling water maker. SUBSCRIBE & SAVE: Get our SodaStream Canister automatically delivered at a frequency of your choice for additional savings. SUSTAINABLE: SodaStream Co2 Cylinders can replace up to 1260 single-use plastic bottles (based on carbonation level & sparkling water maker). SodaStream Co2 cylinders are circular forever when exchagned for refill.