Uneven coffee bed after pour-over brewing
After brewing, the spent grounds sit unevenly in the dripper — a dry patch on one side, a deep well on the other.
Applies to: V60 (pour-over), Chemex, Filter coffee
What the shape of the spent bed shows
CoffeeHQ explanation
When a pour-over finishes draining, the wet grounds left in the filter are a record of where the water went. A flat, level bed means water passed through all of the coffee to a similar degree. A crater, a slope, or grounds stranded high up the filter wall mean it did not. Where the bed is thin, water took a short path and worked that coffee hard; the grounds stuck to the walls were barely rinsed at all.
The cup then contains a mix of over- and under-extracted coffee, which tastes muddled: a little sour and a little bitter, with less clarity than the coffee can give. The cause is nearly always how the water was poured. A stream held in one place digs a hole. A fast, heavy pour throws grounds up the sides. And a bloom that left dry pockets in the bed sets up uneven flow for the whole brew.
Causes, most likely first
There are 2 likely causes, listed with the most probable first. Work down the list and change one thing at a time, so that when the problem goes away you know which change fixed it.
Cause 1 of 2 · Commonly the cause
Pour concentrated in one spot rather than distributed
- How to check
- Are you pouring in a steady circular motion, or mostly in the centre?
- What to change
- Pour in slow, controlled circular motions to keep the whole bed saturated evenly.
Cause 2 of 2 · Reported, not independently verified
No stir or swirl after the bloom
- What to change
- A gentle stir or swirl after blooming can help settle grounds evenly before the main pour.
If none of these fixes it
Check the cleaning and descaling guide. Equipment that needs maintenance can cause several of these symptoms at once, and no change of recipe will correct it.
Work through it for your setup
The causes above are general. These go to the part of a diagnostic that takes this symptom one check and one change at a time.
- Make my coffee better: Conical pour-over (V60 and similar)Every reading for this brewer: the check, and the one thing to change first
- Dialling in filter coffee: the workflow
Wet everything first, then pour to a pattern
Give the bloom enough water to wet all the grounds, roughly two to three times the weight of the coffee, and swirl the brewer gently or stir once so that no dry clumps remain. For the main pours, move the stream in slow circles from the centre out towards, but not onto, the paper, and keep the kettle low so the water lands gently. After the final pour, one gentle swirl of the brewer settles the bed flat and brings stranded grounds back down.
What the bed should look like in each brewer
Tendency, not a guarantee
- Cone brewers such as the V60
- A shallow dome or a flat surface is fine; a deep pit in the centre or a thick ring of grounds on the walls is not.
- Flat-bottomed brewers
- The bed should finish level. They are more forgiving of the pour, because water cannot converge on one point.
- Chemex
- The bed is deep and the paper thick, so drain time is long. A flat finish matters more here because the water spends so long in contact.
When the kettle is the limit
An ordinary kettle pours a wide, fast stream that is hard to aim, and a careful pattern is difficult with one. That does not make good coffee impossible: pour more slowly, from lower, in more and smaller pours, and rely on the final swirl to level the bed. A narrow-spouted kettle makes the same result easier, which is all it does.
Easily confused with
- A stalled brew — A stall is about time: the water will not drain. An uneven bed is about shape, and can happen in a brew that drained in a normal time.
- An uneven grind — A muddy, silted bed with a perfectly level surface points at fines from the grinder, not at the pour.
What not to change at the same time
Do not change the pouring pattern and the grind in the same brew. An even bed often changes the drain time on its own, so settle the pour first and only then decide whether the grind needs moving.
How to tell it is fixed
The bed finishes flat and evenly dark, with clean paper above it, and the cup tastes more distinct: you can name what you are tasting.
Pour-over planner — Enter your dose and ratio and choose a number of pours. It gives the bloom amount and the running total to reach at each pour, so attention can go to where the water lands.
Related issues
What to change
Specific adjustments for this symptom, with what each one trades off.
Learn the technique
Step-by-step guides to the skills this problem comes from.