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Moccamaster CDGT Grand Basket vs Sibarist B3 FLAT

Moccamaster CDGT Grand Basket
Fits
Flat basket
Flow
Unknown · Unknown
Material
Paper · Cellulose
Reuse
Single-use
Availability
In production
How it brews
The flat-bottom basket paper for Moccamaster's CDGT batch brewer, sized for the larger "Grand" basket rather than a wedge cone. It seats in the flat-basket family and interchanges with other basket papers of that fit, not with wedge or cone brewers. Moccamaster publishes no fast/medium/slow class, so we leave flow unrated. Like other batch baskets, the flat bed spreads the coffee wide and it needs no special handling.
Sibarist B3 FLAT
Fits
Flat basket
Flow
Medium · Manufacturer-stated
Material
Paper
Reuse
Single-use
Availability
Specialty only
How it brews
The B3 grade of Sibarist's abaca flat-bottom paper (associated with Matt Winton's flat-bed method), in S and M. Unlike the FAST papers, B3 is a lower-porosity sheet Sibarist rates as medium flow, trading some drainage speed for more body and retention across the flat bed. That medium class is the maker's own framing, not independently measured. It fits the flat-basket seat and interchanges with other flat papers of that fit; a pre-brew rinse is common.