It also occurs to me that these would be an idea method to cheaply scrub CO2 from a confined space. 1) Recirculate the CO2 laden air through the filter. 2) After X period of time pump regular air through the filter to "regenerate" the carbon. Granted algae might be a better solution overall but that requires water and a dry source is much easier to use.
Cross-posted from Dreamwidth ( http://nimitzbrood.dreamwidth.org/271498.html ) but feel free to comment here as well.