Chemex Unbleached Natural Bonded Coffee Filters, Pre-Folded Squares (100-Count)
The unbleached natural filters that make a Chemex a Chemex. Thick bonded paper that captures sediment and bitter fines for a remarkably clean, balanced cup. 100 count, fits 6, 8, and 10-cup Chemex brewers.
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Why We Picked It
The filter is half the reason a Chemex works. It's 20–30% thicker than a standard drip filter, and that extra mass is what gives the brew its signature clarity — pulling out sediment, bitter fines, and microscopic coffee solids that thinner filters let slip through. It's why a Chemex pour-over tastes cleaner than anything you can make with a standard paper cone.
We specifically picked the NATURAL (unbleached) version — not the white ones. White filters are bleached with chlorine or oxygen-based compounds, which can leave trace residues and contribute to dioxin byproducts during manufacturing. The natural filters go through hot water baths only, retaining the paper's original wood color. That's the difference between "passed through a chemical process" and "passed through warm water."
The pre-folded squares are a quality-of-life upgrade over the unfolded version — they drop straight into the carafe without fiddling, which matters at 6 a.m.
How It Fits Our Good Steward Standards
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No Artificial Preservatives
Paper and water. That's the entire ingredient list. Nothing to preserve against.
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Minimal Processing
Hot water baths only — no chlorine bleaching, no dioxin byproducts, no synthetic processing additives.
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Full Transparency
Chemex publishes the exact manufacturing process for both the bleached and unbleached versions. Buying the unbleached version is an informed choice, not a guess.
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No PFAS
Chemex does not publish third-party PFAS testing. PFAS contamination is a known concern in paper food-contact products industry-wide, though unbleached filters made without synthetic processing aids are at lower risk. We'd love to see Chemex certify this explicitly.
Care & Use
Store in a dry place — paper absorbs ambient humidity and can warp. To use: pop a filter open, fit it into the Chemex with the three-layer side facing the pour spout (this reinforces the paper at the pour point), rinse briefly with hot water before adding grounds to rinse out any papery aftertaste and preheat the carafe.
See Also
Around$47.03
Handcrafted borosilicate glass carafe with polished wood collar and leather tie. Made in Massachusetts since 1941. 30 oz capacity — brews for 1–3 people.
