Brewing Guides
The Chemex
Invented in 1941, the Chemex provides a great way to brew an exceptionally clean cup of coffee. The paper, heavier than other pour over filter papers, traps many of the oils and fines (miniscule grounds prone to over-extraction) that contribute to greater bitterness and a heavier body. It also slows the flow of water down, increasing contact time relative to other pour overs, so a slightly coarser grind is required. This results in a smooth cup full of delicate flavours reminiscent of a fine tea. Just don’t forget to rinse that paper first, you don’t want that flavour in there!
When brewed well it's hard to beat such joyful clarity. It's also a great social way of brewing and sharing.
I personally like to pour faster and have a slightly coarser grind as the paper is long, concentrating extraction at the narrow bottom. For this reason there are some who don't like the Chemex, but it really can produce some lovely brews.
You'll need...
- Chemex
- Chemex Filter Paper
- Grinder
- Kettle
- Drip Scales
- Timer
- Stirrer
- Brew time
- 2.30 - 4 minutes
- Brew Ratio
- 1:15 - 1:18
- Water Temp
- 94-96C
Remember these are guidelines, experimentation is encouraged.
- 1
Boil your water & grind your Coffee
Bring your low-mineral content water to boil. Weigh your chosen amount of coffee. Grind the beans to a powder size slightly larger than salt.
30 grams of coffee to 500 ml of water is good here, although you can buy much larger Chemex and double this.
- 2
Prepare the filter paper
Fold the paper and place it into the Chemex so that the triple-fold is facing the spout (folding instructions on the box). Rinse the paper with hot water, allowing the water to heat up the glass. Pour away the water and pour the ground coffee into the cone, ensuring it is level.
- 3
The Bloom
With your Chemex on the scales, pour water gently into the centre and circle your way to the edges, adding in double quantity to the amount of coffee (e.g. 30g coffee/60g water). Watch the coffee swell and rise and then stir to ensure all grounds are soaked. This satisfying sight is called the bloom. Wait 30 seconds to allow carbon dioxide to escape. Now the coffee is more easily extracted.
- 4
Pouring the water
Pour water onto the coffee again, starting in the centre and moving in a circular motion to the edges. Once at the top of the paper, pause and wait. As the level drops you can start pouring again. All in all the brew time should not exceed 4 minutes. Try experimenting with the number of pours, speed of your pour and the extraction this results in. offers more brewing tips.