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Sibarist FLAT (FAST) vs Sibarist APRIL Edition (FAST)

Sibarist FLAT (FAST)
Fits
Flat basket
Flow
Fast · Manufacturer-stated
Material
Paper · Abaca
Reuse
Single-use
Availability
Specialty only
How it brews
The flat-bottom sibling of the FAST cone: a smooth, non-fluted paper using the same abaca technology, sized S (≈Kalita 155) and M (≈Kalita 185) for wave-style flat drippers, plus a larger size for basket machines. Because the wall is smooth rather than pleated, Sibarist markets it as keeping water in even contact with the whole bed and reducing bypass while still draining fast — a mechanism claim from the maker, not a measured result. It drops into a Kalita Wave 155/185 seat, so it's an option anywhere those papers fit. Single-use, made in Barcelona.
Sibarist APRIL Edition (FAST)
Fits
Flat basket
Flow
Fast · Manufacturer-stated
Material
Paper · Abaca
Reuse
Single-use
Availability
Specialty only
How it brews
Sibarist's fast abaca flat-bottom paper cut for April's flat brewer, in S and M. It sits in the flat-basket family and interchanges with flat papers of the matching fit. Same high-permeability abaca sheet as the FAST line: an open flat paper clears the shallow bed quickly, which is the fast, high-clarity brief Sibarist markets (its own claim, not measured here) — build contact time back with a finer grind if you want more. Specialty, single-use, with the usual rinse.