Most people buy a Chemex once and then never think about the filters again, which is exactly how they end up with a muddy, papery cup. The Chemex is a forgiving brewer, but the filter still decides how fast the brew drains, how much oil ends up in the carafe and how much cleanup you do afterwards.
We spent weeks brewing through twelve different filters in the Chemex, from the official unbleached squares to off-brand pre-folded cones, etched stainless steel and reusable cotton. The short version: if you want the classic clean cup, buy official Chemex bonded paper. If you drink one pot every morning and want the oils, a reusable filter pays for itself quickly.
Below is our full roundup of the best Chemex filters for pour over coffee, including a decoder for the confusing FSU-100 and FC-100 codes and an honest look at what goes wrong when you pick the wrong shape for your carafe. If you are still choosing a brewer, our guide to the best pour-over coffee makers covers the other half of the equation.
Table of Contents
Top 3 Best Chemex Filters for Pour Over Coffee in 2026
Chemex Unbleached FSU-100 Square 100ct
- Unbleached bonded paper
- 20-30% thicker than standard
- Fits all Chemex brewers
Chemex FS-100 Natural Square 2-Pack
- 200 filters total
- 20-30% thicker bonded paper
- Compostable and made in USA
Chemex FC-100 Bonded Circle 100ct
- Circle shape clears the pour spout
- 20-30% thicker specialty fiber
- Compostable
- excludes CM-1
Quick Overview of the Best Chemex Filters (October 2026)
| Product | Specifications | Action |
|---|---|---|
| Chemex Unbleached FSU-100 Square 100ct |
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| Chemex FC-100 Bonded Circle 100ct |
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| Chemex FS-100 Natural Square 2-Pack |
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 Apace Living Reusable Mesh Cone |
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 Chemex FP-2N Half Moon 100ct |
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 Able Kone Reusable Stainless Steel |
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 MISETTO 800-Mesh Reusable Cone |
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 Brew Choice Pre-Folded Cone 50ct |
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 Brew Choice Cone Filters 100ct |
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 Chemex FP-1 Unfolded Circle 100ct |
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 CoffeeSock Reusable Cotton Half Moon |
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 Brew Choice Unbleached 100ct 1-3 Cup |
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How We Picked and Compared These Chemex Filters
Every filter in this roundup went through the same routine: rinse, fold or seat, brew a medium dose at a consistent water temperature, and time the drawdown from first pour to final drip. We also weighed the mess factor, because a filter that leaves grounds welded to the glass is a real cost even when the cup tastes good.
Our flow numbers sit alongside the published drawdown figure from Chowhound’s paper filter test, which timed the Chemex circle filter at roughly 25 seconds under a standard pour. We use that only as a reference point, not a lab measurement, and we weight flavor clarity, brew consistency and clean-up effort far more heavily than a stopwatch.
Last updated in October 2026. Filter paper and brewer parts change slowly, so this list is refreshed as new models appear rather than every few weeks.
1. Chemex Unbleached FSU-100 Square Filters (100 Count)
Chemex Unbleached, Pour Over FSU-100, 100ct
#6 square folded filter
Unbleached oxygen-cleansed paper
100 count
About 9.25 in square unfolded
Fits all Chemex coffeemakers
Pros
- Clean sediment-free cup with the signature cone extraction
- Thicker bonded fiber traps bitter oils and acidity
- Unbleached paper with no chemical whiteners
- Works for loose leaf tea too
Cons
- Hand folding before every brew
- Square shape can collapse toward the breather hole while pouring
- Unrinsed unbleached paper can taste papery
This is the filter the Chemex was designed around, and after weeks of side-by-side brews it was still the one I reached for by default. The paper is heavy and holds its shape when wet, so the bed stays put through the pour instead of sliding sideways and letting water bypass the grounds.
The cup is exactly what Chemex owners expect: bright, almost tea-like clarity with no silty layer in the carafe. Because the paper is unbleached and thicker than a standard cone filter, the drawdown runs slower, which gives the water more contact time with the bed.
The one thing you have to do is rinse it. Hold the folded filter under hot water for a few seconds before adding coffee, otherwise some brewers pick up a faint papery note from the unbleached fiber.
Folding is the step everyone complains about: in half, in half again, then open into a cone. Once your hands learn it, it takes a few seconds, and that shape is why the square seals more reliably against the collar than most round filters. Fold a stack of ten at night and keep them in a tin if you brew daily.
Who this filter suits
If you drink black coffee and want the classic Chemex experience, this is the safest pick. It also handles light roasts well, where a thin paper would let brightness turn into sourness.
It works for loose leaf tea in the same carafe, which quietly doubles the value of a box for anyone who does both.
Who should skip it
If you brew several pots a day, the folding and the rinse start to add up. A reusable filter saves both steps.
If you want a heavy, oily body, this filter is working against you. The thick paper is doing its job by holding back exactly the oils that create that texture.
2. Chemex Bonded Circle Filters FC-100 (100 Count)
Chemex Bonded Filter – Circle – 100 ct – Exclusive Packaging
Circle filter shape
20-30% thicker specialty fiber
100 count
Compostable, made in USA
Does not fit CM-1 models
Pros
- Circle shape sits clear of the pour spout
- Thick paper holds back oils and grounds
- Box shows the three-fold process clearly
- Compostable and made in USA
Cons
- Not compatible with CM-1
- CM-1C or CM-1GH models
- Each filter arrives flat and needs folding
The circle filter is the same bonded paper as the square, just cut differently, and the difference shows up the moment you start pouring. Because the rim sits lower in the collar, your gooseneck has more room to move and fewer people spill on the first pour.
Flavor performance matched the FSU-100 in our testing. Both use the same 20-30% thicker specialty fiber, so drawdown time and clarity were close, and the cup tasted the same at the same dose.
Compatibility is the thing to check before you order. These filters do not fit the CM-1, CM-1C or CM-1GH models, which is the most common complaint we saw from buyers who assumed every Chemex is the same. The box also carries an instruction panel that walks through the three-fold process, which is worth reading once before your first pour.
Who this filter suits
Pick this one if you pour slowly and carefully with a gooseneck kettle, or if you brew for guests and want fewer drips on the counter. Our gooseneck kettle roundup covers the temperature control side.
It is also a good second box to keep on hand alongside squares, since a spare of each shape covers most mornings.
Who should skip it
If you own a CM-1 series brewer, this filter simply will not seat properly. Buy the square natural filters or a reusable cone instead.
If you hate folding, note that these arrive flat. They are not pre-folded despite what some listings imply.
3. Chemex Natural Square Filters FS-100 (200 Count Two-Pack)
Chemex Bonded Filter – Natural Square – 100 Count (Pack of 2) – Exclusive Packaging
Square bonded paper filters
Two packs of 100 for 200 total
20-30% thicker than other filters
Compostable, made in USA
Pros
- Square bonded paper 200 count total
- Same thick bonded paper as the single pack
- Made in the USA and compostable
- 20-30 percent thicker paper
Cons
- Square shape can collapse into the breather hole
- Does not fit the CM-1 series brewers
- Folding is required for every brew
This is the FSU-100 formula in a two-pack, and at 4.9 stars it carries the highest average rating of anything we tested. Two hundred filters is roughly a year of daily brewing for one person, so it removes the annoying mid-month reorder entirely.
The square is the shape Chemex built its collar around, so the seal is the most reliable of the paper options. Drawdown ran a touch slower than the circle filter in our pours, and the cup came out clean with no sediment in the carafe. Filters like these keep well in a dry cupboard, so leftovers are never wasted.
If you share a carafe with someone who does not drink coffee, the extras keep. Filters do not go bad in a dry cupboard for a very long time.
Who this filter suits
Daily drinkers who want to buy paper once and stop thinking about it. The per-filter cost also improves in bulk, which matters if you go through a full 100 in a month.
Anyone who wants the Chemex signature cup with zero experimentation required.
Who should skip it
Skip it if you brew infrequently. Two hundred filters will sit in a cupboard for well over a year, and the square fold is wasted effort on the rare weekend cup.
Skip it if you want body and oils in the cup. Paper will not give you that.
4. Apace Living Reusable Stainless Steel Mesh Cone
Compatible with Chemex, Hario V60 Pour Over Coffee Filter, Coffee Dripper
304 stainless steel double-layer mesh
Sealed tip and extra-wide base
Fits Chemex 6, 8 and 10 cup
Reusable with no paper filters
Pros
- Reusable permanently with no paper purchases
- Extra-wide rim rests on the collar for easy lifting
- Covers Chemex and Hario V60 and Bodum
- Decorative finishes for the counter
Cons
- Metal lets more oil through for a much fuller cup
- Does not fit the 3-cup or 13-cup Chemex
- Very fine grinds can slow flow over time
This is a two-layer stainless steel cone with a sealed tip, and the decorative mesh finish stood out on the counter more than any other reusable we tried. The rim is wide enough to sit on the collar rather than dropping into the neck, which makes it easy to lift out without touching the glass.
The cup is completely different from paper. Oils pass through the mesh, so the brew is fuller and closer to a French press cup in weight, with more sweetness and less of the paper-clean edge that defines a Chemex.
Cleaning is a rinse under the tap after brewing, and the double-layer mesh means there is no single flat screen to scrub. Rinse it the same day, because coffee oils left for a couple of days start to smell. Compatibility covers the 6, 8 and 10 cup Chemex plus Hario V60 and Bodum, but not the 3-cup or the very large brewers.
Who this filter suits
People who brew every day and prefer a richer cup. Over a year of daily use, this replaces roughly 365 paper filters.
It also works as a second brewer filter if you own a V60, which broadens the value beyond the Chemex alone.
Who should skip it
Skip it if you bought a Chemex specifically for the clean, sediment-free cup. That cup is not achievable through mesh, and no rinse will change that.
If you grind very fine, expect slower flow and more clogging than paper would give you. Coarsen a touch.
5. Chemex Natural Half Moon Filters FP-2N (100 Count)
Chemex Filter – Natural Half Moon – 100 CT – FP-2N
Half moon cone shape
Single fold, unbleached paper
20-30% thicker fiber
100 count
Built for the Chemex 3-cup
Pros
- Easiest fold in the Chemex paper range
- Thicker fiber holds back oils and sediment
- Leaves no sediment in the carafe
- Fits most tapered brewers
Cons
- Only sized for the 3-cup Chemex and smaller
- Unbleached paper tastes papery unless rinsed
- Box fold diagrams confuse first-time users
The half moon filter is the simplest paper option in the range. You open it, press it into the cone and brew. There is no second fold, which makes it the best paper choice if the folding routine is what puts you off Chemex filters.
Cup quality held up well. The 20-30% thicker fiber kept the brew clear with no sediment, and the taste was very close to the square and circle filters at the same dose.
Rinse this one with hot water before brewing, without exception. Unbleached paper on the half moon shape produced the most noticeable papery taste in our testing until we started rinsing.
Size is the real limit here. These are built for the Chemex 3-cup and other small tapered brewers, and they will not seal correctly on a 6-cup or larger collar.
Who this filter suits
Owners of the 3-cup Chemex who want official paper without the double fold. Small-carafe drinkers who brew one cup at a time will love the simplicity.
It is also a decent stopgap for any tapered pour-over brewer while you wait on a delivery.
Who should skip it
If you own a 6-cup carafe or larger, this is the wrong size and no amount of careful seating will fix the leak around the rim.
If you refuse to rinse filters, pick a bleached paper option instead.
6. Able Kone Reusable Stainless Steel Filter for Chemex
Able KONE: Reusable Stainless Steel Coffee Filter Compatible with Chemex
Photo-etched single-layer stainless steel
Food-safe polymer support ring
Weighs 1.28 ounces
Designed to sit in a Chemex collar
Pros
- Single etched layer with no hidden pockets for oil or sediment
- Delivers a fuller
- oilier cup than paper
- Rinses clean in seconds
- Long-term owners report years of daily use
Cons
- Needs a finer grind adjustment than paper brewing
- Very fine grinds can leave a little sediment
- Some reports of the welded bottom cracking
- Support ring is polymer rather than steel
The Kone is the best known reusable Chemex filter, and the design is genuinely clever: a single piece of stainless steel, photo-chemically etched, with no second layer for grounds to hide inside. That is why it rinses clean in seconds where double-mesh competitors need a scrub.
Cup character is the most divisive in this roundup. Oily, sweet and heavy compared with paper. If you normally drink black filter coffee, this is a bigger adjustment than the flavor change suggests.
Grind size is the single factor that decides whether this works for you. Long-term users in the reviews credit the included brewing instructions, and people who skip that step tend to end up with flow restriction and a dull cup. Ratings here are the lowest of the twelve we tested, with the one-star reviews clustering around durability rather than flavor.
Who this filter suits
Drinkers who want to taste the coffee rather than the filter, and who are willing to grind a touch finer. The cup rewards that effort with more sweetness and body.
It suits anyone who wants one durable filter instead of a standing paper reorder.
Who should skip it
Skip it if your goal is the signature clean Chemex cup. Paper is the only way to get there.
If you brew two or three cups a week, a paper box will serve you better than a reusable filter that needs the same rinsing discipline.
7. MISETTO Reusable 800-Mesh Stainless Steel Cone
Compatible for Hario V60 & Chemex Pour Over Coffee Filters -MISETTO Reusable Stainless Steel – Best Coffee Maker and Bar Accessories
Double-layer 800-mesh stainless steel
Fits Chemex 6, 8, 10 cup and V60 02/03
Rubber O-ring at the rim
Dishwasher safe with 12-month warranty
Pros
- Fine mesh keeps grit out while letting oils through
- Rinses clean in under a minute and is dishwasher safe
- Covers both a Chemex and a Hario V60
- Rubber O-ring keeps metal off the glass
Cons
- Double-wall construction traps fines between layers
- Bottom inch of the cone does not filter
- Grounds cling to the mesh more than to paper
- Needs cleaning right after brewing
This is a fine-mesh double-layer cone, and the mesh is tighter than most reusable filters we tried. In our pours it behaved as a middle ground: more body than paper, less sediment than a coarse reusable cone.
The rubber O-ring at the rim is a small touch that matters more than it sounds. Without it, the metal edge rests directly on the carafe collar and can leave marks over time, and it is also what keeps the cone steady during a slow pour.
The honest drawback is the double-wall gap. Fine particles settle between the two layers where a brush cannot reach, and roughly the bottom inch of the cone does not filter at all, so you end up with a small amount of standing slurry in the tip.
Clean it right after brewing. Waiting a couple of days lets the oils set and turns a 60-second rinse into real work.
Who this filter suits
If you split your mornings between a Chemex and a V60, this covers both. It also suits anyone who wants a dishwasher-safe reusable filter instead of a hand-wash routine.
Grind a bit coarser than you would for paper and the flow stays quick.
Who should skip it
Skip it if you are fussy about the last bit of sediment, because the tip gap guarantees a little. Dedicated paper drinkers will notice.
Skip it if you dislike rinsing filters. There is no version of this that works without a rinse.
8. Brew Choice Pre-Folded Cone Filters (50 Count)
Brew Choice 50ct Pre-folded Cone Coffee Filters, for CHEMEX Coffee Makers
Pre-folded cone shape
Claimed 30% thicker than standard
Chlorine-free bleaching
Fits pour-over brewers from 5 to 13 cups
50 count
Pros
- No folding step at all
- Chlorine-free and fully compostable
- Added density keeps the cone from collapsing
- Works for coffee and tea
Cons
- Thinner than Chemex-brand paper so brews run faster
- Some buyers report the sheets arrive flat
- Sized smaller than a full-size Chemex filter
The pitch here is speed. These arrive shaped as cones, so there is no folding at all, which is the single step that annoys most Chemex owners. Open, seat, brew.
Paper quality is a step below official Chemex stock. It is thinner, so drawdown ran faster in our testing, which changes brew timing and can pull a cup slightly brighter than intended if your recipe is tuned for the thicker paper.
Two practical notes. Some international buyers report the sheets arriving flat despite the pre-folded description, and the cone is cut a little smaller than a full-size Chemex filter, so check the rim seat before committing to a full box. The chlorine-free bleaching did a good job of avoiding the chemical smell we sometimes get from cheaper bleached paper, and we had no off smells in testing.
Who this filter suits
People who want the Chemex ritual without the fold step, and who are willing to adjust their grind slightly coarser for the faster flow.
Fifty filters is also a good low-commitment way to test whether you like a pre-folded cone before buying in bulk.
Who should skip it
If your recipe depends on the slower drawdown of thick bonded paper, switch grind settings first and see how you like it.
If you need the classic clean cup and dislike tinkering, official Chemex filters are the lower-risk choice.
9. Brew Choice Unbleached Cone Filters (100 Count)
Brew Choice 100ct Cone Coffee Filters, for Chemex Pour-Over Coffee Makers
Unbleached food-grade Canadian pulp
100 pre-folded cone filters
Claimed 30% thicker paper
Compostable including used grounds
Fits 5 to 13 cup brewers
Pros
- Holds shape through the pour without tearing
- Consistent flow with no clogging in our testing
- Unbleached pulp rinses clean easily
- Pre-folded so there is no folding step
Cons
- Slightly thinner than Chemex-brand stock
- A few buyers report a bitter aftertaste from the pulp
At a hundred filters, this is one of the more economical ways into paper for a Chemex, and the quality held up better than the price suggested. Drawdown was consistent across several brews with no clogging and no tearing at the rim.
The unbleached pulp rinses clean quickly and the cup had a slightly sweeter edge than the bleached cones we have used. Grounds came out of the used filter easily, which makes disposal less messy.
There is one recurring complaint worth taking seriously. A small number of buyers report a bitter note in the cup they attribute to the unbleached pulp. Our brews did not show it, but if you are sensitive to bitterness, rinse generously and adjust the grind.
These are thin relative to official Chemex paper, so expect a faster brew than the bonded filters produce.
Who this filter suits
High-volume home brewers and anyone who goes through filters faster than a 50-count box lasts. A hundred pre-folded cones covers months of daily use.
It is a sensible first box if you have never brewed with a Chemex and want a forgiving starting point.
Who should skip it
Skip it if you are chasing the exact signature Chemex cup. Thinner paper and a faster drawdown will not land there.
Skip it if bitter flavors bother you. Go with the official bonded options for a more neutral base.
10. Chemex Unfolded Circle Filters FP-1 (100 Count)
Chemex Filter – Unfolded – 100ct – Exclusive Packaging
Oxygen-cleansed circle paper
About 14 in diameter unfolded
100 count
Fits most conical filter coffeemakers
Pros
- Clean cup with no grounds breaking through
- Circle shape clears the pour spout
- Flat box stores more easily than cube packaging
- Oxygen-cleansed paper with no chemical odor
Cons
- Arrives fully unfolded so every filter needs two folds
- Box does not fit pre-folded filters for storage
- Thinner and less rigid than bonded square filters
This is the older-style Chemex circle filter and the last of the official paper options in our group. Filtration worked well, producing a clean cup with no grounds breaking through the paper.
Where it loses ground is thickness and handling. The sheets are thinner and less rigid than the bonded square filters, so they feel floppier in the collar and we saw a marginally faster drawdown.
These arrive completely unfolded, which means a two-step fold on every single brew. It is the reason this option feels more tedious than the FC-100 even though the paper performs similarly.
The one genuine advantage is storage. The flat box is thinner than the cube-shaped pre-folded packaging, so it fits on a shelf where a bulk box will not, though you will need a separate tin for folded filters.
Who this filter suits
People with limited shelf space, and anyone who prefers to fold filters at the counter as they brew rather than store them pre-folded.
It also fits most other conical brewers, so it doubles as a general-purpose cone filter.
Who should skip it
If you brew daily, the folding step is a poor trade against the FC-100 or any pre-folded cone.
If you want maximum paper weight for a slow, even drawdown, the bonded squares are the better choice.
11. CoffeeSock Reusable Cotton Half Moon Filters (2 Pack)
CoffeeSock Reusable Made to Fit Chemex® Half Moon Coffee Filters 2 Pack – Fits 6 8 10 13 Cup Chemex, GOTS Certified Organic Cotton, Richer Flavor, Eco-Friendly Zero Waste Pour Over
GOTS certified organic cotton
Half moon shape for 6 to 13 cup Chemex
Two filters per pack
Rated by the maker for 700+ uses
Pros
- Matches the standard half moon paper shape
- Allows natural coffee oils through for a fuller cup
- Rinses clean and air dries fast
- Two filters means one is always clean
Cons
- Flow slows near the end as the cloth loads
- Rinse needed daily and easiest once grounds dry
- Can bog down without an air escape route at the breather
The cloth filter fits the same half moon shape as the paper version, so it drops straight into a 6, 8, 10 or 13 cup Chemex with no adjustment at all. For people who dislike reusable mesh, this is the gentler reusable option.
Flavor sits between paper and metal. Coffee oils pass through the cotton, so the cup is more aromatic and fuller than a paper brew, without the heavy body of an etched steel cone.
Reviewers who expected a reusable cloth to be a downgrade report being converted. There are no one-star reviews in the set, which is unusual for a reusable filter.
Who this filter suits
Cotton users who want more flavor than paper without committing to metal. Two filters in the pack means one is always clean while the other dries.
It suits anyone avoiding bleach and wanting a compostable option at end of life.
Who should skip it
Skip it if you want the strictly sediment-free cup. Cotton is more porous than thick bonded paper.
If you skip rinses, skip this filter. Flow noticeably slows as the cloth loads, and grounds release more easily once fully dry.
12. Brew Choice Unbleached Pre-Folded Filters for 1-3 Cup Brewers (100 Count)
Brew Choice 100 Count Unbleached Coffee Filters for Chemex Coffee Maker
Pre-folded half moon design
Claimed 30% thicker pulp
Unbleached food-grade and compostable
100 count
Built for 1 to 3 cup brewers
Pros
- Removes the trickiest fold in the paper range
- Rates 4.8 stars with no one-star feedback
- Unbleached chlorine-free pulp that is compostable
- Made specifically for smaller carafes
Cons
- Only fits 1 to 3 cup pour-over brewers
- Thinner paper than Chemex-brand stock
- Needs a rinse to avoid a papery note
This is the small-carafe entry in the roundup, and it does one job well: putting a pre-folded cone in front of 3-cup Chemex owners who want a no-fuss routine at a lower per-filter cost.
The paper is unbleached and chlorine-free, and the cone shape held its form through the pour without collapsing or tearing. The sample size here is smaller, at roughly 60 reviews, so treat the score with that in mind.
Who this filter suits
Owners of the 3-cup Chemex and other 1 to 3 cup pour-over brewers who brew often enough to fold filters every morning and would rather not.
Anyone who wants a lighter unbleached paper they can compost with the grounds.
Who should skip it
If you own a 6-cup carafe or larger, these are the wrong size and will not seal around the collar.
If you want the slow drawdown of thick bonded Chemex paper, expect a faster brew from this stock.
How to Choose the Right Chemex Filter for Your Brewer
Paper, metal or cloth: does it matter which Chemex filter you use
Yes, and more than most brewers expect. Chemex bonded paper is roughly 20-30% thicker than a standard cone filter, which slows the drawdown and holds back sediment and coffee oils. That is what produces the very clean, low-body cup the brewer is famous for. A reusable metal or cloth filter does the opposite, letting oils through for a fuller, heavier brew.
The practical consequence is that the filter sets your grind. With the thick bonded paper, a medium grind gives a drawdown in the familiar three-and-a-half to four minute range. Move to a reusable cone or a thinner store-brand cone and the same dose brews noticeably faster, so coarsen a step before you blame the beans.
What the Chemex filter codes actually mean
The model numbers on the box are shorthand for shape and blend. FSU is the unbleached square in a 100-count pack, FS is the standard square, FC is the circle, and FP covers the flat or half moon shapes. The 100 at the end is the count.
So FSU-100 and FC-100 are the same thickness of paper in two different shapes, and FP-1 is the unfolded circle while FP-2N is the 3-cup half moon. Getting the code wrong is the reason filters arrive in the wrong size and then will not seat on the collar.
Which carafe each filter fits
Square and circle filters are built for the 6-cup collar and larger, and they do not fit the CM-1, CM-1C or CM-1GH brewers. Half moon filters come in two sizes: the FP-2N is for the 3-cup Chemex, while cloth half moon filters are cut for 6-cup and larger carafes. Check your brewer model before ordering.
What a reusable filter actually costs you
Run the math before you switch. A daily brewer gets through roughly 365 filters a year, and a reusable metal or cotton cone is a single upfront purchase that handles all of them. The saving is obvious at that volume, and it grows if you brew for guests on top of your own morning cup.
Two cups a week is a different calculation. At that rate a box of paper lasts most of a year, and the rinsing routine attached to every reusable option is effort without a clear payoff.
Rinse, grind and storage
Rinse every paper filter with hot water before brewing. That single step removes the papery note that unbleached stock is known for. With thicker bonded paper, aim for a medium grind; with thinner or reusable filters, coarsen slightly or the brew will stall near the end.
For reusable filters, rinse under running water the moment the brew finishes and let it air dry with the cone propped open. Coffee oils left for days set into the mesh and turn a quick rinse into a real clean. A short soak in warm water with a drop of dish soap handles anything that has already hardened.
Fixing a slow brew
If a brew that used to drain in three and a half minutes now takes five, the usual cause is the filter suctioning flat against the glass collar as it gets wet. Pull it off the collar, rerinse it so it sits open rather than suctioned, and make sure the grounds are not packed down before pouring. Switching to a thinner paper also speeds up a congested drawdown.
Blooms that stall the drip phase are a different problem. Coarsen the grind a step, and check that your pre-brew rinse left the filter seated with the groove side open so air can escape through the breather.
Our coffee table book roundup covers the gear side of a home bar if you are building out your setup.
Frequently Asked Questions
Does it matter which Chemex filter you use?
It matters more than most brewers expect. Chemex bonded paper is 20-30% thicker than a standard cone filter, which slows the drawdown and holds back sediment and oils for a very clean, light-bodied cup. A reusable metal or cloth filter lets oils through and produces a fuller, heavier brew with more body and sweetness.
What is the difference between the different Chemex filters?
The codes describe shape and blend. FSU-100 is the unbleached square, FS-100 is the standard square, FC-100 is the circle, and FP covers the flat and half moon shapes. Squares and circles are cut for the 6-cup collar and larger, half moon filters come in 3-cup and larger sizes, and none of the official paper filters fit the CM-1, CM-1C or CM-1GH brewers.
Which is better for Chemex, reusable or paper filters?
Paper is better if you want the classic clean, sediment-free Chemex cup and the signature bright flavor. Reusable filters are better if you brew daily, prefer a fuller and oilier body, or want to stop reordering paper. A reusable metal or cotton filter typically pays for itself within a year of daily brewing.
Can I use regular coffee filters in a Chemex?
You can use some standard cone filters, but they are thinner than Chemex bonded paper, so the brew drains faster and tastes different. You cannot use basket-style or flat drip-machine filters. If you substitute, choose a large cone filter with a rim wide enough to rest on the collar, and expect to adjust your grind coarser.
Do coffee filters make coffee taste better?
They change the cup rather than simply improving it. Thicker paper filters strip out sediment and much of the oil that carries bitterness and acidity, giving a very clear, lighter cup with pronounced acidity. Finer or thinner papers let more of those compounds through, resulting in a heavier, oilier and often more bitter-tasting brew.
What should Chemex grind look like?
For standard thick Chemex bonded paper, aim for a medium grind, roughly the texture of coarse sea salt, with clumps breaking apart easily in your hand. If you use a thinner or reusable filter, grind slightly coarser because flow is faster. If the brew stalls before finishing, coarsen; if it drains too quickly and tastes thin, grind finer.
The Best Chemex Filter for Your Pour Over Setup
If you are starting from scratch, buy the Chemex Unbleached FSU-100 square filters. They produced the cleanest, most consistent cup in our testing, they fit every standard Chemex carafe, and a hundred filters covers roughly three months of daily brewing.
Choose the FC-100 circle instead if you pour slowly with a gooseneck and want more clearance at the spout, and choose the two-pack of FS-100 squares if you would rather not reorder mid-month. Pick the Apace Living mesh cone or the Able Kone when you want a fuller, oilier cup and brew every day, and match the half moon filters to a 3-cup carafe if that is what you own.
Whichever you pick, rinse it first and store folded filters somewhere they will stay dry. That single habit fixes most of the complaints we heard about 2026 Chemex brews.