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@dalias Do you live in a (yellow) submarine?'A strong alkali like potassium hydroxide can be used to scrub CO2. I'm sure there are available solutions for small, air tight volumes (submarines, hyperbaric chambers, spacecraft). A simple DIY would be a pump running air through an alkali solution - maybe a big aerator for aquatiums (something that forms fine bubbles).

Here's Hackaday inspiration:
https://hackaday.com/blog/?s=Scrubber