Explainer · Filters

AeroPress filter throwdown: paper vs metal

The AeroPress pushes coffee through a small round filter held in a screw-on cap. Swap the paper for a metal disk and the same recipe makes a noticeably different cup. Here is what the manufacturer and published comparisons say about each option — no home test results, just the sourced differences.

The two families

Paper micro-filters are the default. Wikipedia notes each AeroPress base unit has shipped with a pack of 350. AeroPress says paper’s quality and thickness let it absorb oils and catch fine particles, giving “a very clean cup”.

Metal disks are reusable stainless steel filters. AeroPress itself recommended against metal mesh in 2017, according to Wikipedia, but now sells its own stainless filter. Third-party disks include the Able DISK and DISK Fine, and in 2012 Prima Coffee’s round-up also mentioned a Kaffeologie mesh filter and a cloth filter from American Coffee Trader.

Side by side

Prices as shown on AeroPress’s blog page when checked, October 2026.

Grind size is the hidden variable

AeroPress gives useful numbers: espresso-style grounds are roughly 300–500 microns but include a significant mass of particles around 100 microns; medium grinds run 800–900 microns with boulders near 1,000 and fines down to 100. Coarser grinds produce fewer particles under 200 microns. With a 178-micron metal filter, that means a fine grind sends far more solids into the cup than a medium one. If a metal-filter cup is muddy, the grind is usually the first thing to change.

What published comparisons found

• 2012 DISK Fine discussion (Prima Coffee): users reported a fuller body than paper, with less sediment than Able’s original DISK.
• Home-Barista forum blind tasting: a group working with a coffee school in Florence brewed the same inverted recipe (15 g coffee, 190 g water at 92 °C) through paper and an IMS Superfine metal filter. Their four tasters described paper as lower in bitterness and higher in tartness, “very similar to a V60”, and metal as sweeter with stronger body and fruit aroma — and preferred the metal cup. Commenters pointed out that four tasters is a small sample.

Neither is a lab study, and preferences split. The consistent finding is the direction of change: metal adds body and texture; paper adds clarity.

Recipes AeroPress suggests for metal

AeroPress also notes that stopping at the hiss reduces texture, that stacking filters lightens body, and that a coarser grind with a longer steep (2:30–3:00) tends toward a sweeter cup.

The health footnote

Harvard’s Nutrition Source says filtered (drip) coffee contains almost no diterpenes, while unfiltered coffee such as French press contains diterpenes that can raise LDL cholesterol. Metal-filtered AeroPress coffee sits closer to the unfiltered end. Details: metal filters & cafestol.

Which to choose

• Want clarity, easy cleanup, lower diterpenes → paper.
• Want body and no consumables → metal, with a medium grind.
• Curious → try both on the same coffee; see how to run a fair comparison.