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Chemex grind size

Chemex grind size on a 1Zpresso J-Ultra

For Chemex on a 1Zpresso J-Ultra, start at 2.8.5. That is about 700 µm, a medium grind.

1Zpresso J-Ultra setting for Chemex2.8.5Medium grind, ~700 µm
Finer 2.7.3Coarser 2.9.7Step size 2.5 µm

Adjusting from 2.8.5

WhenSettingParticle size
Finer: sour or thin cups2.7.3~671 µm
Start here2.8.5~700 µm
Coarser: bitter or dry cups2.9.7~731 µm

Lower numbers are finer. To grind finer, turn the setting down. Change one step at a time, and brew again before changing anything else.

Starting recipe for Chemex

Steps

  1. Rinse the thick filter well and dump the water.
  2. Add 30 g of medium-coarse coffee.
  3. Pour 60 g, wait 45 seconds, then pour slowly to 480 g by about 2:30.
  4. Let it drain. Total time is around 4:00 to 4:30.
  5. Taste. Sour: grind a little finer. Bitter or muddy: grind coarser.

Other brew methods on a 1Zpresso J-Ultra

Chemex on other grinders

Questions

What grind setting is best for Chemex on a 1Zpresso J-Ultra?

Start at 2.8.5 and adjust by taste. Lower numbers are finer. To grind finer, turn the setting down.

How do I know if I should grind finer or coarser?

Fast and sour: grind finer by a step or two. Slow and bitter: grind coarser.

Where does this setting come from?

The 1Zpresso J-Ultra is mapped to particle size in microns, fitted from the Honest Coffee Guide's settings for this grinder. It is a starting point, not a guarantee.