Somebody correct me if this isn't right but my understanding is that ROX is a more porous carbon and does a better job (per unit volume) of absorbing impurities than other forms of carbon.
That said, if you use a larger amount (and/or perhaps over a longer period of time) of an inferior grade of carbon, you should still be able to achieve the same results.
In other words, it's just more efficient.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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