What’s the Difference between Pellet-style and Foam-style Carbon Filters?

What’s important for a carbon filter is
a) the total weight of carbon used (increases the lifespan)
b) the total area of carbon available (increases the CADR)

So foam style carbon filters may well have a higher CADR short term, but a drastically reduced lifespan. Another ‘pro’ is lower air resistance, which allows more air through. But this is at the detriment of lifespan and possibly CADR.

NOTE: above CADR all refer to f-CADR or ‘formaldehyde CADR’. That is, CADR for VOCs not p-CADR (CADR for particulates/PM2.5).

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