CO2 scrubbers in spacecraft don't generate oxygen either. They only absorb CO2. https://www.quora.com/How-do-the-CDRA-and-Vozdukh-systems-scrub-carbon-dioxide-

CO2 scrubbers in spacecraft don't generate oxygen either. They only absorb CO2. https://www.quora.com/How-do-the-CDRA-and-Vozdukh-systems-scrub-carbon-dioxide-from-the-air-on-the-International-Space-Station-ISS https://www.quora.com/How-do-the-CDRA-and-Vozdukh-systems-sc...