Chemex Brew Guide

Data

Equipment:
Chemex, Scale, Timer, Grinder, Pitcher

Brew Time:
2:00 min

Water:
200g (7oz) purified water at 93C (199F)

Coffee:
15g (0.53oz)

Method

1. Put the paper in your chemex and give it a good rinse with hot water. It removes all paper taste and preheat the equipment.

2. Remove the rinsing water.

3. Grind your coffee beans to a medium grind setting. Add the coffee, tare your scale, start your timer.

4. Pour 30g (1.0oz) water to create the bloom. At 30 secs: pour in 70g (2.5oz) water. At 50 seconds: pour 50g (1.7oz) water. At 60 second: pour the last 50 g water into the brew.

5. Pour in circular motions so all coffee is extracted evenly.

Controlling Balance

To brew coffee well, extraction is an important concept to understand. If we were able to dry out coffee grounds after they have been brewed, they will have lost about 20% of their weight. This is the amount that we have dissolved into our cup during brewing, and the percentage is termed extraction. This is important, as flavour does not extract from coffee in a linear way, more is not necessarily more. When we begin to brew a coffee, the natural acids present in the coffee will extract most easily, followed by sugars, and then heavier bitter compounds towards the end of the brew. This means controlling how much we extract from a coffee will control the balance of flavour in your cup. Extract too little, and we have a sour coffee, too much acid from the beginning of the brew, and not enough sweetness to create balance. Extract too much, and we will extract too much bitterness from later in the brew, resulting in an overall bitter and drying cup.

There are two main ways we can control extraction, in ANY method of brewing coffee. Grind Size, and Contact Time. The table below shows a guide to controlling extraction when brewing.

Coffee Tastes Too Bitter/Dry Too Sour
Grin Size Coarsen Fine
Contact Time Reduce Increase

By tweaking these variables, and tasting every cup you brew with a critical pallet, you’re sure to be brewing transparent and delicious brews. See other brew guides:

Brew Guides

Philosophy

Brightness

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