Pour-over brew stalls or drains too slowly
Water sits on top of the coffee bed and drains far slower than your usual brews, which often leaves the cup bitter or drying.
Applies to: V60 (pour-over), Filter coffee
Why a pour-over slows to a crawl
CoffeeHQ explanation
Water drains through a pour-over by passing between the coffee particles and then through the paper. Anything that closes those gaps slows it. The usual culprit is fines: the dust-sized particles every grinder produces alongside the size you asked for. As water moves down through the bed it carries them with it, and they settle in a dense layer at the bottom and in the pores of the filter, where they act like silt in a drain.
Grinding finer makes more fines and smaller gaps at once, which is why a small change at the fine end of the range can turn a three-minute brew into a six-minute one. Heavy pouring makes it worse by stirring fines out of the bed and into suspension, from where they migrate to the paper. A stalled brew has also had water sitting in the coffee far longer than intended, so it tends to taste bitter and drying.
Causes, most likely first
There are 3 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 3 · Reported, not independently verified
Grind too fine for the dripper
- What to change
- Use a coarser grind.
Cause 2 of 3 · Reported, not independently verified
Too many fines clogging the filter bed
- What to change
- Check grinder consistency; a burr grinder with fewer fines can help.
Cause 3 of 3 · Reported, not independently verified
Filter not rinsed or wetted evenly before brewing
- What to change
- Rinse the paper filter with hot water before adding coffee.
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
- A lot of fine dust: silty cups and slow, clogged filtersThe possibilities, the quickest check and one thing to change first
- Dialling in filter coffee: brew time is a reading
How it shows up on different brewers
Tendency, not a guarantee
- V60 and other cones
- All the water converges on one point, so fines concentrate at the tip. A gentler pour and a slightly coarser grind usually clear it.
- Kalita Wave
- The three small holes can be covered by fines or by a filter that has slumped. Check that the paper sits flat on the base before adding coffee.
- Chemex
- The thick paper is slow by design, and a filter sealed against the spout traps air below. Put the three-layer side against the spout so air can escape.
Easily confused with
- A brew that is simply large — Bigger batches take longer because there is more water to pass and a deeper bed. If the flow is steady and only the total time is long, nothing has stalled.
- A grinder that makes too many fines — If the brew stalls at grind settings that should be comfortably coarse, the grinder is producing excessive dust and no setting will fix it.
What not to change at the same time
Do not grind coarser and change how you pour in the same brew. Change the grind first, since it has the larger effect, and only adjust the pour if the stall persists.
How to tell it is fixed
The water level should fall steadily after each pour and the bed should be flat and evenly damp at the end, not a muddy pool. The finished cup should lose its harsh, drying finish.
What to change
Specific adjustments for this symptom, with what each one trades off.
Work it out
Interactive tools that take you through this one change at a time.
Learn the technique
Step-by-step guides to the skills this problem comes from.