I've used the airgas and medvet products. The airgas uses smaller granules with more surface area and lasts bit longer. Both are reasonably priced .Both are used in CO2 control in antesthia use for humans and animals respectively.
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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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