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The US side of ISS uses a cyclic machine called the Carbon Dioxide Removal Apparatus (CDRA) to absorb CO2 from the air and then vent it to space. You can read about the cycles of the CDRA in this answer and its linked references. Older spacecraft used lithium hydroxide (LiOH) canisters, which were a disposable item, and therefore more problematic for the ISS....


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