I’ve owned the same Chemex for longer than some of my other coffee gear has survived being owned at all, and that’s really the whole review in one sentence. The CM-8A is the classic 8-cup Chemex, the hourglass-shaped glass vessel with the wood collar and leather tie that’s been made essentially unchanged since 1941, and it’s still one of the best purchases you can make if you want genuinely great coffee without a single moving part to break.
What the CM-8A actually is
It’s a single piece of borosilicate glass, the same heat-resistant glass used in laboratory equipment, shaped into an hourglass with no metal parts touching the coffee at any point. The 8-cup size holds 40 oz (1.2 L), a real wood collar handles the heat so you can grip the neck safely, and a leather tie holds the collar in place. You pour hot water over grounds in a cone-shaped filter at the top, and gravity does the rest. There’s no pump, no heating element, no plastic, and nothing here to eventually fail the way a machine’s electronics or seals do.
The filter is the actual secret, not the glass
Chemex-specific filters (FP-2, FC-100, or FS-100 depending on which size and fold you prefer) are noticeably thicker than a standard cone filter, and that thickness is doing real work. It catches more of the fine sediment and oils than a typical paper filter, which is why Chemex coffee comes out unusually clean and bright, closer to a tea than the heavier body you get from a French press. If you’ve ever tried brewing a Chemex with a generic filter because that’s what you had on hand, you’ve probably noticed the coffee comes out muddier and less distinctly “Chemex” than it should. The proprietary filter isn’t a gimmick here; it’s most of what defines the actual result.
Getting a good result from it
Use a medium-coarse grind, close to what you’d use for a standard cone pour-over, and a ratio around 1:16 (roughly 45 g of coffee to 720 ml of water for a fuller 8-cup batch, scale down for smaller pours). Bloom the grounds with a small amount of water first and let them sit for 30 seconds before continuing the pour in slow, controlled stages. The wide vessel means heat escapes faster than a smaller pour-over dripper, so use water just off the boil rather than water that’s been sitting for a while. For the full comparison against other pour-over drippers and cone shapes, our pour-over comparison guide covers where the Chemex fits against a V60 or Kalita Wave.
Keeping it running for decades, not years
The main failure point isn’t the glass, it’s the wood collar and leather tie, which can dry out or fray over years of use but are both sold separately as replacement parts rather than forcing you to replace the whole carafe. The glass itself is dishwasher safe once you remove the collar and tie, though hand washing avoids any risk of it knocking against other dishes and chipping. Beyond that, there’s genuinely little to maintain. No descaling, no gaskets, no motor to burn out.
How it actually differs from a V60 or Kalita Wave
The biggest practical difference isn’t the glass shape, it’s capacity and cleanup. A V60 or Kalita Wave is built for single cups or small batches; the Chemex’s 8-cup size makes it genuinely better for brewing for two or three people at once without switching methods. The thick proprietary filter also means a slightly slower, more forgiving brew than a thinner V60 filter, small pouring inconsistencies matter less. What you give up is portability and speed. A V60 is smaller, cheaper, and faster to rinse out; the Chemex is the one you leave out on the counter because it’s also, frankly, good looking enough to double as counter decor.
Frequently asked questions
Can I use a generic cone filter instead of the Chemex-branded one?
You can, but the coffee will taste noticeably different, thinner-bodied but muddier at the same time, since a standard filter doesn’t catch the fine sediment the way Chemex’s proprietary paper does. If you’re buying one specifically for the Chemex experience, don’t skip the matching filters.
Is the 8-cup size the right one to buy?
For most households, yes. Chemex also makes 3-cup, 6-cup, and 10-cup versions; the 8-cup is the most common because it comfortably handles both a single large mug and a small multi-person pour without being unwieldy on the counter.
Does hard water cause any buildup issues?
Less than you’d think, since there’s no heating element or internal plumbing for scale to accumulate in. Mineral staining can build up on the glass itself over time; a soak in a vinegar-water solution followed by a normal wash clears it.
Who should actually buy this
Someone who wants excellent coffee and doesn’t mind that brewing it takes active attention for a few minutes rather than a push-button result. It’s a poor fit if you want to program a pot the night before and wake up to coffee waiting, that’s what a drip machine is for. But if you’re making coffee for yourself or a couple of people and want a genuinely superior cup from a device that will realistically outlive you, the Chemex has earned its reputation honestly, and 85 years of essentially the same design is not nothing.
It’s also worth being honest about what it isn’t. It’s not the fastest way to make coffee in the morning, it’s not dishwasher-simple with the collar attached, and the glass, while durable in normal use, will break if you drop it the way a stainless carafe wouldn’t. None of that has stopped it from becoming a permanent fixture in serious home coffee setups and plenty of actual cafes, which says something about how much the finished cup matters compared to the minor daily friction of using one.
Is it actually worth the price compared to a basic drip machine?
If you already care enough about coffee to be reading a Chemex review, yes. It’s a one-time purchase with no ongoing electrical cost and no parts that wear out the way heating elements and pumps eventually do, so the math works out well over a long enough timeline even against a cheaper machine that needs replacing every few years.
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