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Sibarist GRAYCANO (FAST) vs CoffeeSock Cotton (V60)

Sibarist GRAYCANO (FAST)
Fits
V60 cone
Flow
Fast · Manufacturer-stated
Material
Paper · Abaca
Reuse
Single-use
Availability
Specialty only
How it brews
Sibarist's fast abaca cone paper cut for the Graycano dripper. It sits in the V60-cone seat and interchanges with other cone papers of the matching fit. Same high-permeability, low-clog abaca sheet as the FAST line, which Sibarist positions as draining faster than a standard cone paper so you can grind finer without choking the bed (its own claim, not measured here). Specialty, single-use, with the usual rinse.
CoffeeSock Cotton (V60)
Fits
V60 cone
Flow
Unknown · Unknown
Material
Cloth
Reuse
Washable, reusable
Availability
In production
How it brews
A reusable organic-cotton cloth filter cut for the V60 in 01/02 sizes. Like nel cloth, it passes more oils and some fines than paper — landing between paper's clarity and metal's heavy sediment — while cutting single-use waste. It needs the cloth-filter care routine: rinse thoroughly after each brew, store wet (many refrigerate it), and periodically boil it clean, or old coffee oils will turn the cup stale. There's no manufacturer or community flow rating within the V60 seat, so flow is left unrated.