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Originally Posted by creep
Ari, what's the reason for the CO2?
Oh, I found out the answer - never mind. Thanks.
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He actually convert the marine system to the fresh water. here's is the info about the reactor
'A calcium reactor offers a simple and convenient solution for maintaining calcium and alkalinity in your reef tank. After the initial setup, the calcium reactor requires minimal maintenance. A calcium reactor is almost a necessity for tanks heavily stocked with stony coral where calcium and alkalinity demands are high.
It is also a great addition for those looking to boost the growth of coralline algae on their live rock. Calcium reactors provide a steady supply of calcium by using CO2 to dissolve media in the reactor and, thus, releasing calcium into your water. The effluent released also acts as a buffer to stabilize pH.'
Here is the info about aragonite:
http://en.wikipedia.org/wiki/Aragonite
Very Xpensive .....