One main pour or two?
With total water fixed, how does splitting the post-bloom water into two additions affect your brew?
Protocol only: BrewLab has not performed or measured this comparison. Planned numbers are examples, not results. Taste suggestions are hypotheses; no outcome is guaranteed.
Pour structure can influence agitation, water level and drainage together. The practical factor here is the post-bloom pouring pattern. This is not a way to isolate one microscopic mechanism; it is a way to compare two clearly specified routines you can repeat.
Set up a fair comparison
What you need
A pouring kettle, scale with readable running mass, timer, the same brewer and filters, one grinder and at least 40 g of one coffee.
The factor you change
Post-bloom pour pattern. A: 48 g bloom + one 272 g addition. B: 48 g bloom + two 136 g additions.
What to keep consistent
Keep 20 g coffee, 320 g total water, 93°C kettle setting, grinder setting, filter prep and a 48 g bloom ending at 45 seconds. Keep pour height and approximate stream style consistent; do not re-tare between pours.
| Plan | A | B |
|---|---|---|
| Dry coffee | 20 g | 20 g |
| Input water / espresso yield | 320 g | 320 g |
| Ratio (dose : water or yield) | 1:16 | 1:16 |
| Kettle / machine setpoint note | 93°C | 93°C |
| Grind plan | Your baseline grinder setting | Your baseline grinder setting |
| Duration in recipe template | 180 s — replace with observed time | 180 s — replace with observed time |
These are planned settings. Template durations are editable placeholders, not targets to force or measured results. For espresso the water/yield field means collected espresso; otherwise it means input water.
Setup saves two recipes only, without changing existing recipes, creating brew records or deducting stock. Choose a bean bag and confirm usage separately when recording each brew. Local storage details.
Run the comparison
- Write the cumulative targets before heating water: A ends at 48 then 320 g; B ends at 48, 184 then 320 g. Added mass and cumulative mass are not interchangeable.
- For both brews, begin timing at first wetting, bloom to 48 g and wait until 00:45.
- For A, pour the remaining 272 g continuously from 00:45, without overflowing the brewer. Record when the pour and final drainage actually finish.
- For B, add 136 g from 00:45 to reach 184 g. Start the second 136 g addition at 01:30, reaching 320 g. If the first addition cannot finish in that interval, stop and redesign the schedule rather than silently overlapping it.
- Compare taste at similar drinking temperatures. Repeat the two routines in reversed order and note any spills, unusually high water level or bed disturbance.
Record what actually happened
Actual added and cumulative masses, start/end of each pour, pour height, final drawdown, collected mass and descriptive notes.
Use the unfilled table below as a prompt. To retain your own observations, download the blank CSV sheet or save A and B as separate brew records in My brews. Text typed into a downloaded file stays in that file; it is not synchronized to the journal.
| Record after brewing | Cup A | Cup B |
|---|---|---|
| Actual dose, water or yield | Your observation | Your observation |
| Actual grinder / setting | Your observation | Your observation |
| Actual time and timing convention | Your observation | Your observation |
| Taste and confidence | Your observation | Your observation |
| Enjoyment and next step | Your observation | Your observation |
This download contains labels and blank observation cells, not fabricated sample outcomes.
Interpret without overclaiming
Differences may involve agitation, water level and contact time simultaneously. Describe the routine that worked better rather than claiming one extra pour always increases extraction. A reproducible procedure matters more than matching an arbitrary final time.
What this cannot establish
The factor is an entire pouring pattern with coupled consequences. A different kettle, brewer size or operator may produce a different result. The displayed 180-second recipe duration is only a placeholder; replace it with your measured time when logging.
Choose the next test
If one pattern is easier to reproduce, repeat it before experimenting with pour speed or height.
In the journal, select the actual A and B records and check dates before drawing a conclusion. The paired comparison link uses the latest saved record for each experiment recipe; it is not a statistical test and may select different sessions. A repeated pair with reversed preparation order is more informative than a single cup, but it still describes your coffee and conditions.
References and scope
NIST: controlling nuisance factors in experimental design. This reference supplies background, not a validation of BrewLab’s recipe values or proof of any result. The protocol, example settings and record sheet are independently written for this site.
Use stable equipment and handle hot water carefully. Follow brewer and basket capacity instructions. No recipe, taste or date in this guide establishes food safety or equipment suitability.
All six experiment plans →