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CHEMEX paper filters in six steps: three layers face the spout

How to open and seat an appropriate CHEMEX Bonded filter in a 6-cup-or-larger brewer, keeping the spout air channel clear.

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Wikimedia Commons · Hay Kranen / Wikimedia Commons / CC BY 4.0; original file displayed unchanged. · CC BY 4.0 ↗

CHEMEX specifies how its Bonded filters are folded and oriented, rather than using any paper cone at random. This guide covers compatible filters for brewers of six cups and larger; three-cup and Funnex models have different filter sizes.

Your try-it-at-home checklist

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1. Check brewer size and filter type. Use a CHEMEX Bonded filter specified for a brewer of six cups or larger; do not assume an ordinary dripper cone fits.
2. For an unfolded round filter, fold in half and in half again, then open into a cone. With a pre-folded filter, distinguish the three-layer side from the single-layer side.
3. Place the thicker three-layer side of the paper against the glass pouring spout. The single-layer side should face the opposite wall.
4. Seat the filter so it does not seal the spout's air channel. Blocking this air path can cause unusually slow draining.
5. Optionally rinse the paper and preheat the carafe with hot water. CHEMEX says pre-wetting is not required; discard the rinse water before adding coffee. Avoid burns from hot water and glass.
6. Add appropriately ground coffee and brew, then dispose of the used filter safely. Do not assume the same folding instructions apply to other CHEMEX sizes or filter styles.

CHEMEXFilter Series Info and Support — How to use CHEMEX Bonded filters ↗Official instructions for filter sizes, opening the cone, and placing the three-layer side toward the spout.CHEMEXCHEMEX FAQ — filter pre-wetting and spout air channel ↗Manufacturer states pre-wetting is optional; explains the need for the spout air channel and possible slow drainage.Wikimedia CommonsChemex coffeemaker with filter.jpg — Hay Kranen CC BY 4.0 ↗Individual original file, photo author, CC BY 4.0 license and credit independently verified.Wikimedia CommonsReusing content outside Wikimedia — technical hotlinking guidance ↗Commons allows hotlinking but explicitly requires compliance with each file's license and attribution conditions; hotlinking is not a license.

Your try-it-at-home checklist

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