April Flat Bottom Paper vs Sibarist ETKIN (FAST)

Fits

Flat basket, Kalita Wave 155, Kalita Wave 185

Flow

Fast · Manufacturer-stated

Material

Paper · Cellulose

Reuse

Single-use

Availability

Specialty only

How it brews

The Copenhagen roastery's own flat-bottom paper, sold Small (≈Kalita 155 / Origami S) and Large (size 175, for the April plastic brewer). It's cut to sit deep with a wide base and is marketed as flowing faster than conventional flat papers — that speed claim is April's, kept as a class rather than a number here. One honest ambiguity: older retailer copy described April filters as using Sibarist's abaca FAST technology, while the current listing says virgin wood pulp (cellulose); we record cellulose per the direct listing but don't treat abaca as confirmed. It drops into a Kalita Wave 155/185 seat, so it interchanges with those papers.

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 the Etkin's 8-cup batch bed. It sits in the flat-basket family and interchanges with flat papers of the matching fit. It's the same high-permeability, low-clog abaca sheet as the rest of the FAST line, shaped for a larger batch bed, which Sibarist frames as fast-draining so the grind and pour set the pace rather than the paper (its own claim, not measured here). Specialty, single-use, with the usual pre-brew rinse.