Conventional paper filters are a random mat of wood pulp fibres, which means pore size varies across the sheet. HIFLUX use lyocell fibre in a woven three-dimensional structure instead, giving a more uniform pore size and more room for fines before the bed chokes. HIFLUX state a flow rate up to 42% faster than standard paper.

What that changes in the cup

Faster drawdown means you can grind finer for the same brew time, which usually raises extraction. It also means less time with water ponding on top of the bed, which is where uneven extraction tends to creep in. HIFLUX design the pore size to let particles below roughly 20 micrometres pass through, so a controlled amount of ultra-fines ends up in the cup. That adds texture and body compared to a filter that holds everything back. If you brew light roasts and have been stuck at coarse settings to avoid stalls, this is the main reason to try them.

Choosing between 01 and 02

The two sizes differ in sheet size, not material or flow behaviour. Size 01 covers roughly 1 to 2 cups and suits single-serve brews on a small conical dripper such as the V60 01. Size 02 covers roughly 1 to 4 cups and is the one to pick for a V60 02 or for batches above about 20 g of coffee. If you brew mostly one cup at a time but occasionally brew for two or three, size 02 still works: a larger sheet folded into a smaller dripper is workable, while an undersized sheet is not.

Folding and fit

These ship flat and are folded by hand, with no glued seam. That takes a few seconds per brew, and in exchange they seat in any conical dripper rather than being cut for one model. Fold along the centre, open into a cone, and rinse as you normally would. Because the material is naturally neutral with no bleach or sizing agents, a rinse is mainly about preheating rather than removing paper taste.

Specifications

What’s in the box

• 50 × HIFLUX HIGH FAST Folding V filters in the selected size