Probably the more expensive way to use carbon and chemical filters but very convenient. Less rinsing is required as the medium is supplied prepackaged and ready to use (already slightly damp). All you have to do is change the package. Tip: Put this bag next to the old one for a few days to make sure bacteria have settled in it, then remove the old bag. This minimizes fluctuations in the bacterial population and ensures rapid recolonization. This is useful if you have a small tank as it minimizes ammonia related fluctuations as the bacterial population changes. I'm not sure about the effectiveness of this stuff, but I'd venture to say that it's about as effective as other forms of activated charcoal and a little more convenient because it contains resins to remove other chemicals.
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