[RobGR]

I've thought about making a C02 scrubber for indoor use. The simplest way, using commercial lime, would mean replenishing a consumable to keep it going. The C02 scrubbers that acquarium owners use also don't seem to be able to be regenerated.

I think it would be interesting to see what effect, if any, an indoor C02 level of near 0 would have on humans and mammals. Because your blood has to stay in a narrow PH range, and C02 is part of maintaining that, I wouldn't presume it would be good.

I think a small desktop C02 scrubber might have a market in the same demographic that pays for air ionizers, de-ionizers, HEPA filters and incense burners.