Seawater as CO2 filter

One of the major issues with keeping people in underwater habitats has for a long time been been the chemicals needed to scrub the CO₂ from the air. Aquarius, the underwater laboratory in Florida uses 25 kilo of chemicals every day. Now Lew Nuckols of the US Navy have figured out how to use seawater to do the job instead. New Scientist article [subscription required].
This is pretty cool as I have always envisioned to have a underwater laboratory in connection to any substantial OTEC and mariculture installation. Unlikely to happen in the near term considering Aquarius’ US$10,000 operating costs, but one can always dream, right?