[pmat]

Very cool! It sounds like your sorbent requires calcium to precipitate calcium carbonate from sea water. What would be the source of this calcium? Hopefully it won't come from reducing lime!

[marcuslima]

The calcium all comes from dissolved calcium bicarbonate - we trigger precipitation by shifting bicarbonate to carbonate ions, which are insoluble. Essentially we acceelrate the oceanic carbonate cycle

[LeifCarrotson]

I understand that calcium salts and bicarbonate ions are common in the ocean, and are increasingly common as the oceans become more acidic, but have no idea how common that is.

How much seawater do you need to get one kg of CaCO3 precipitate?