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CO2 from the air or stirred water depending on whether the reactor is sealed to the air, loosley covered or open with just a crust on top.. Maybe input water sourcing CO2 . Increased proportion of precipitated impurities and/or calcium carbonate in the powder in the reactor limiting saturation.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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