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percolation method

Kalita Wave

A flat-bottomed pour-over dripper with a wave-shaped filter and three small holes, designed to distribute water more evenly across the coffee bed than cone-shaped drippers, making pour technique somewhat more forgiving.

Coffee-to-water ratio
60–68 g per litre (typically 63)
Grind
Medium.
Water temperature, as commonly used
90-96 celsius (typically 93)°C
Contact time
150-210 seconds (typically 180)
Skill level
beginner

Descriptive grind labels like this are illustrative starting points, not precise measurements — the same label can mean different particle sizes on different grinders. See the grind size guide for how to dial this in on your own equipment.

In short

The Kalita Wave is a pour-over dripper with a flat floor instead of a point. Three small holes in that floor let the coffee out, and a pleated paper filter, the wave that gives it its name, holds the grounds away from the walls.

It is the pour-over most often recommended to people who find a cone dripper inconsistent. The shape does some of the work that technique has to do in a V60, so the difference between a careful pour and a hurried one is smaller.

What a flat bed changes

CoffeeHQ explanation

In a cone, the coffee bed is deep in the middle and shallow at the edges, and all the water converges on one opening. Water in the centre passes through much more coffee than water near the wall. A flat-bottomed dripper gives every part of the bed roughly the same depth, so the water's path through the coffee is more nearly the same length wherever it lands.

The three small holes add a second effect. They drain more slowly than a single wide opening, so water pools briefly above the bed instead of running straight through. That short pause makes the brew behave a little like an immersion, and it means the flow rate is governed partly by the brewer and not only by how you pour.

The pleats matter too. They leave air gaps between paper and wall, which keeps the filter from sticking to the sides and lets the brewer hold its temperature more steadily than a paper pressed against cold ceramic.

A forgiving place to begin

Typical range

Sixteen grams of coffee to 250 grams of water makes one large cup in the smaller model.

A forgiving place to begin
VariableTypical rangeWhat moving it does
Coffee to waterAbout 60–68 g per litre (roughly 1:15 to 1:17)
GrindMediumOften a touch coarser than for a V60, because the restricted drain already lengthens contact.
Water temperatureAbout 90–96 °C
BloomAbout twice the coffee's weight, for 30–45 seconds
Total brew timeAbout 2½–3½ minutesA result to read, not a target to force.

Starting points only. The two sizes of Wave differ in bed depth, and the stainless, glass and ceramic versions do not drain identically.

Pouring in pulses

Widely documented

Many Wave recipes add the water in several small pours, letting the level drop a little between each, instead of one continuous stream. Each pulse stirs the bed slightly and keeps it from compacting, and the pauses stop the brewer from flooding.

Pour into the middle and in small circles. Pouring directly onto the pleats can push the paper flat against the wall and collapse the air gaps that the design depends on.

Slow drains and lopsided beds

CoffeeHQ explanation

The brew drains very slowly or stops

Usually because: Fine particles have settled over the three holes, or the filter has slumped so its base no longer sits flat.

Change first: Grind a little coarser, and seat the filter flat before adding coffee.

Why a pour-over stalls

The spent bed is higher on one side

Usually because: The pour favoured one side, or the dripper was not level on the cup.

Change first: Level the dry grounds with a gentle shake and keep the pour central.

An uneven pour-over bed

Pleasant but flat, lacking brightness

Usually because: The even, slightly immersion-like extraction rounds off acidity that a faster cone would show more vividly.

Change first: Grind slightly coarser to speed the flow, or try the same coffee in a cone dripper.

Flat-bottomed or cone-shaped

Tendency, not a guarantee

  • V60 — More responsive to technique and often brighter and more distinct at its best, but less consistent from one brew to the next.
  • Chemex — Much thicker paper for an even lighter body, and better suited to brewing several cups at once.
  • Batch brewer — Most use a flat-bottomed basket for the same reason: an even bed is easier to extract evenly without a person pouring.

What to do next

  • Learn pulse pouring — The pouring pattern this brewer is most often used with.
  • Plan the pours — Works out bloom and cumulative pour weights for your dose.
  • Dial in filter coffee — A method for adjusting one variable at a time until the cup tastes right.
  • Explore the variables — Shows which direction grind, ratio and temperature push extraction and strength.
  • Become a barista — A structured programme from dose and grind through milk, drinks and maintenance.

Owning a Kalita Wave: the two sizes, the paper and the flat bed

The sections above explain what a flat bed changes and give a recipe to start from. This part is for the person with the dripper in their hand: which size it is and which paper it takes, what each feature is for, what each change tends to do in a flat-bottomed brewer, and how to read a brew that went wrong. Most of it holds for other flat-bottomed drippers with fluted papers.

Your maker's instructions come first. Kalita publishes what its dripper is designed to do and how its papers and glass should be handled, and the lines marked as the maker's are from its own pages, in CoffeeHQ's translation from the Japanese. Its own guide to brewing with the Wave is published as pictures and video, which were not read for this page, so the amounts here are not Kalita's. What it says about taste is its own claim.

I have just bought one. What do I do first?

  1. Find out whether it is a 155 or a 185. The number is on the box and on the papers. The maker describes its stainless 155 as for one to two people and its stainless 185 as for two to four. The 185 is visibly wider across the base.
  2. Check the papers match. The maker's instruction is to use the dedicated Wave filter, and each size takes its own: Wave 155 papers for the 155, Wave 185 for the 185. The other size will not sit flat.
  3. Wash the dripper and choose what it stands on. Warm water and washing-up liquid, rinsed well. The dripper needs a cup or server whose rim it sits on steadily, since the base is wide and the opening underneath has to be clear.
  4. Seat a paper without flattening its pleats. Drop the paper in so the flat base lies on the bottom and the pleats stand free of the wall. The pleats are the design; pressing them against the side undoes it.
  5. Rinse the paper if you choose to, gently and in the centre. Rinsing warms the dripper and the server and is common practice. Pour into the middle and let the water run outwards. A hard pour against the pleats can fold the wall inwards before you start.
  6. Weigh a starting recipe. Use the starting recipe in the section above, by weight, in the size of dripper it was written for. Level the bed with a gentle shake.
  7. Wet the coffee, wait, then pour onto the coffee and not the paper. Wet all of the grounds, wait about half a minute, then pour the rest in a few gentle pours, keeping the water on the bed and away from the fluted wall.
  8. Look, taste, and change one thing. Note how long it took to drain, whether the bed finished flat, and how the cup tastes once it has cooled a little. Then change one thing for the next brew.

What each part of a Wave dripper is for

The flat base, which the maker calls the Wave Zone
The coffee lies in a bed of even depth across a flat floor, where a cone gives a bed that is deep in the middle. The maker's description is that the flat bottom lets the grounds wet evenly even when the water is poured unevenly.
The three holes
Three small outlets in the base. They, with the paper and the coffee, set how fast the brewer drains. The maker says that with three holes the coffee does not stay long in the filter and the Wave Zone.The maker goes on to say that fewer off-flavours are extracted and only what tastes good drips through. That is its claim about taste, not a measurement CoffeeHQ has read.
The Wave paper
A flat-bottomed paper with a pleated wall. The maker's point is that the paper touches the dripper over a small area, so water does not pool in one part of the filter and drips through promptly. The pleats also hold the paper's shape.
The gap between paper and wall
Because only the tips of the pleats touch the dripper, there is air between most of the paper and the wall. It lets the wall of the paper drain. It also means water poured onto the wall runs down outside the coffee.
The material
Stainless steel, glass and ceramic versions are sold. Steel is light and will not break. Glass and ceramic take more heat from the first pour unless they are warmed, and can chip or break.The maker's caution for its heat-resistant glass, given under its servers and decanters, is that it is not toughened: it can break if knocked or dropped.

155 or 185: what the size changes, and why a recipe does not simply scale

CoffeeHQ reasoning

The maker gives the two sizes as one to two people and two to four. The difference that matters when you brew is the area of the floor. The 185's bed is wider, so the same weight of coffee lies shallower in it than in the 155.

Bed depth is a large part of what slows the water. A small dose in a 185 makes a thin bed that drains quickly and can taste thin whatever the grind. A large dose in a 155 makes a deep bed and fills the paper close to its rim, which drains slowly and leaves little room to pour.

So a recipe written for one size is a starting point in the other, not a conversion. Keep the ratio of coffee to water when you scale, and expect to move the grind: usually a little finer for a small brew in a wide dripper, a little coarser for a large one. How much is something to find by brewing. No formula is offered here because none that CoffeeHQ has read is better than tasting.

If you mostly brew one cup, the 155 gives that cup a properly deep bed. If you mostly brew for two or more, the 185 has the room. Either can do the other's job less comfortably.

The drawdown is something to read, not a time to hit

CoffeeHQ reasoning

How long the water takes to drain tells you how much the bed, the paper and the three holes resisted it. It moves when something else has moved: the grind, the dose, the size of the brew, how hard you poured, a different box of papers. Compare a brew with your own last brew in the same dripper.

A flat-bottomed dripper tends to vary less from one pour to the next than a cone does, which is why it is often called forgiving. That is common experience, not a measurement. It does not make a particular time correct. A brew that drains sooner or later than a recipe says and tastes good needs nothing changed.

What changes what in a Kalita Wave

Each line is a tendency and the mechanism behind it, not a promise about taste. The last part of each says what else the result depends on.

Grindfiner or coarser
Finer packs a tighter bed, so the water usually drains more slowly and takes more from the coffee. Coarser does the reverse.
But it also depends on: The grinder. Very fine particles settle over the three small holes and slow the brew more than the setting suggests.
Dose and watermore coffee or more water
More coffee for the same water is a stronger cup and a deeper bed, which drains more slowly.
But it also depends on: The size of the dripper, since the same dose is a different depth in each.
Batch sizea small brew or a full one
A small brew in a wide dripper gives a shallow bed that drains fast. A full one gives a deep bed and a slurry close to the top of the paper.
But it also depends on: Whether the ratio was kept, and whether the grind was moved to suit.
Pour ratefaster or slower
A fast pour raises the water level quickly and stirs the bed. A slow pour keeps the level low and the bed calmer.
But it also depends on: The kettle. The same intention gives different pours from different spouts.
Pour heighthigher or lower
Water falling from a height digs into the bed and stirs it, which speeds up what the water takes and lifts fine particles. A low pour disturbs it less.
But it also depends on: The grind. A dusty grind punishes a high pour more than a clean one.
Agitationa stir or swirl, or none
Stirring evens out wetting and speeds extraction. It also sends fine particles down towards the holes, so the drawdown tends to lengthen.
But it also depends on: Doing it the same way each time.
Slurry levelkept low, or filled high
A high level puts water against more of the pleated wall, where some of it can pass through the paper without going through the bed. A low level keeps the water working through the coffee.
But it also depends on: The dose and how many pours you use.
The paperseated and standing, or folded in
A paper whose wall has folded inwards covers part of the bed and changes how it drains. A different maker's flat-bottomed paper may not fit or drain the same way.
But it also depends on: Using the size made for the dripper, which is the maker's own instruction.
Water temperaturehotter or cooler
Hotter water generally dissolves more, more quickly.
But it also depends on: The dripper. A cold glass or ceramic one cools the first pour unless it was warmed.

When a Kalita Wave goes wrong

For each thing you might notice: what to consider, since there is rarely one cause, and the first thing to try. One change, then brew again.

It drains very fast

Consider

  • A small brew in a 185, so the bed is shallow
  • A grind that is coarse for this coffee
  • Water poured down the pleated wall and round the bed
  • A lighter dose than you meant

Try first: Check the dose and that you poured onto the coffee. If the brew is small for the dripper, that is the likelier cause: grind a clear step finer, or brew that amount in a 155.

Read a fast brew in Make my coffee better

It stalls, or drains very slowly

Consider

  • Fine particles settled over the three holes
  • A paper wall that has folded inwards
  • Heavy stirring or a high pour
  • A deep bed from a large dose
  • A grind that is too fine

Try first: Look at the paper first: if the wall has collapsed, that is the cause. If not, pour lower and leave out one stir next time, with the grind unchanged. If it still stalls, grind a clear step coarser.

Work through a stalled pour-over

The cup is weak

Consider

  • Too little coffee for the water: balanced and simply thin
  • A fast drain through a shallow bed: thin and also sharp
  • Water that went down the wall and round the coffee

Try first: Decide which it is. Balanced and thin is strength: use more coffee for the same water. Thin and sharp is about what was taken: grind finer and leave the amounts alone.

Why strength and extraction are two things

The cup is strong but hollow

Consider

  • A lot of coffee for the water, so the cup is intense without being full
  • Coffee that is past its best
  • Uneven wetting, so part of the bed did most of the work
  • The water

Try first: Add a little hot water to the cup. If it opens up and tastes more complete, the brew was strong: use a little less coffee. If it stays empty, read the roast date before changing the recipe.

Read a hollow cup, with the checks in order

The cup is bitter or drying

Consider

  • A strong brew: the bitterness fades when water is added
  • A long, slow drain with mud over the holes
  • A dark roast with water straight off the boil
  • Old coffee oil in the server or grinder

Try first: Add a little hot water to the cup. If the bitterness fades, use a little less coffee and leave the grinder alone. If it stays, and the brew also drained slowly, grind a clear step coarser.

Work through bitter coffee

There is a layer of fine mud on the bed

Consider

  • A grinder that makes a lot of very fine particles
  • A grind set finer than the coffee needs
  • Stirring or a hard pour that brought the fines to the top and then the bottom

Try first: Pour more gently before changing the grind. If the mud is there however gently you pour, the grinder is the likelier cause.

When the grinder is the problem

The bed finishes uneven: a hollow, a slope or a high rim of grounds

Consider

  • Pouring in one place
  • A dripper that is not standing level
  • A pour onto the wall that washed grounds up the paper
  • A bed that was not level to begin with

Try first: Level the dry bed with a shake, pour in slow circles over the coffee, and check the dripper sits flat on the cup.

Fix an uneven bed

The paper tears, or its wall collapses

Consider

  • Water poured hard against the pleats
  • A paper of the wrong size
  • Papers stored crushed, so the pleats have lost their shape
  • The full, wet paper lifted by pinching its edge

Try first: Pour onto the coffee and keep the papers in their stack. To empty the dripper, tip it out or lift the paper from underneath; the maker warns that a used paper picked up by pinching can lose its bottom.

Change one thing, observe, learn

Each of these changes one thing and holds the rest. Brew the two side by side where you can, and write down what you notice before deciding which you prefer.

  • The same recipe at two grinds

    Change
    Brew at your usual setting and a clear step finer.
    Keep the same
    The coffee, the dose, the water, its temperature and how you pour.
    What to notice
    How much longer the finer brew takes to drain and what it does to the cup. This tells you what a step on your grinder is worth in this dripper.

  • A low pour against a high one

    Change
    Pour one brew from just above the bed and the next from well above it.
    Keep the same
    The grind, the dose, the water and the number of pours.
    What to notice
    The drawdown, the mud on the bed and whether the high pour picked up a drying finish.

  • Three pours against six

    Change
    Pour the water after the bloom in three equal pours, then in six.
    Keep the same
    The grind, the dose and the total water.
    What to notice
    Which keeps the water level lower, which drains more slowly, and which you would rather drink.

  • Half a recipe in the same dripper

    Change
    Brew your usual recipe, then exactly half of it.
    Keep the same
    The ratio, the grind and how you pour.
    What to notice
    How much faster the half brew drains and how it tastes. This is the size question, shown in your own dripper.

What to avoid with a Kalita Wave

  • Lifting the used paper out by pinching it. The maker warns that the bottom may give way, and asks users not to do it.Maker's instructions: Kalita Co., Ltd.
  • Using a paper that is not the Wave filter for your size. The maker's instruction is the dedicated Wave filter in a Wave dripper.Maker's instructions: Kalita Co., Ltd.
  • Cleaning the maker's heat-resistant glass with abrasive nylon pads, metal scourers or coarse cleanser. The maker says these scratch the glass and can cause it to break. It gives the caution under its glass servers and decanters; a glass dripper is the same material.Maker's instructions: Kalita Co., Ltd.
  • Putting a glass server over a flame or in an oven, heating it empty, pouring cold water into it while it is hot, or touching hot glass with a wet cloth or standing it on a wet surface. These are the maker's cautions for its heat-resistant glass servers.Maker's instructions: Kalita Co., Ltd.
  • Pouring onto the pleated wall. Water that runs down outside the bed reaches the cup having touched little coffee, and a hard pour can fold the wall in.CoffeeHQ reasoning
  • Treating a brew time as a quality target. Time is a reading of how much the bed resisted the water; the cup is the result.CoffeeHQ reasoning
  • Changing the grind, the pour and the amount in the same brew. If the cup changes you will not know which of the three did it.CoffeeHQ reasoning

Looking after it

Every time

  • Tip the paper and grounds out, or lift the paper from underneath, and rinse the dripper with hot water. Look through the three holes: they are small and can hold a film of coffee.Common practice
  • Keep the papers in their stack, dry and away from strong smells. A paper whose pleats have been crushed will not stand off the wall.Common practice

From time to time

  • Wash glass with a soft sponge and washing-up liquid, which is the maker's instruction for its heat-resistant glass.Maker's instructions: Kalita Co., Ltd.
  • Wash steel and ceramic the same way when a film builds up, and rinse until no scent of detergent remains. Whether a particular dripper can go in a dishwasher is for its own packaging to say.Common practice

Parts that wear

Wave papers
The consumable, and specific to the size. Papers that arrive or are stored crushed are worth replacing, since the pleats are what the design depends on.Common practice
A glass or ceramic dripper
Nothing wears in normal use. A chip or a crack is a reason to stop using it, since it is filled with near-boiling water. The maker says its heat-resistant glass is not toughened glass.CoffeeHQ reasoning

What else changes how it is used

Only the things that change the brewing. None of this is a list of things to buy.

The right Wave papers
The dripper is designed around them, they are not interchangeable between sizes, and they are less widely stocked than cone papers. Running out stops the brewer.
A scale
The question of 155 against 185 is a question of dose and depth, and neither can be held steady by eye.
A narrow-spouted kettle
Keeping water on the bed and off the pleated wall is the one pouring skill this dripper asks for.
A burr grinder
The three holes are small, and the amount of dust in the grind decides whether they stay clear.

From the first brew to knowing it well

  1. Seat the paper and keep the water off the wall. Until this is habit, collapsed papers and weak cups will look like grind problems.
  2. Make it repeatable. Weigh the coffee and the water and brew the same thing until two cups in a row taste the same.
  3. Learn the grinder in this dripper. One step each way, noting what it does to the drain and to the cup.
  4. Learn what batch size does. Brew half and full at one ratio, and note how the grind has to move to keep the cup the same.
  5. Change the structure on purpose. Fewer or more pours, a lower pour, a cooler kettle for a dark roast. One change, against a brew you know.

Improve this, from here

Equipment

Common problems

  • Uneven extraction if the filter is not seated flat

Ensure the filter sits flat against the base so the three holes drain evenly.

Work through what you noticed, for this method: the possible causes, the one change to try first, and what to look for in the next brew.

Taste variables you can control

Derived from CoffeeHQ's own Change the Taste guidance for this method, not a marketing feature list.

  • Grind size
  • Pouring pattern
  • Water temperature
  • Agitation
  • Dose
  • Filter
  • Water amount

Change the taste

Kalita Wave is a pour-over dripper close enough to V60 that the same grind, pour and temperature guidance applies.

Tastes sour

(Kalita Wave)

The brew tastes sour or thin, and often drains through faster than your usual brews. Flow and taste agree here: the water took little from the coffee.

Try the first step below on its own, taste, then move to the next one only if needed.

ChangeTryWhyWatch for
FirstGrind sizeDecrease: a small step finerSlows the drawdown and usually increases extraction.—
Pouring patternCheck / reset: pour more slowly and evenly across the whole bedEven saturation extracts more consistently than fast, off-centre pouring.Very slow pouring can itself stall the brew if the grind is already fine.
Water temperatureIncrease: a few degrees hotterHotter water extracts more quickly, within the method's normal range.—
AgitationIncrease: ensure a full, even bloom before the main poursA poorly saturated bloom leaves parts of the bed under-extracted.—

Check for channelling first (water finding a fast path through the bed) — that can taste sour even with a correct grind, and the fix is even pouring, not a finer grind.

When to reset: Return to your usual grind and pour pattern before making a second change.

Full troubleshooting: Coffee tastes too sourFull troubleshooting: Uneven coffee bed after pour-over brewingRelated toolRelated tool

Want to know why? Extraction, Contact time

Tastes harsh or dry

(Kalita Wave)

The brew tastes bitter or dry, often alongside a slow, stalling drawdown. Flow and taste agree here: the water stayed long and took a great deal. A strong brew can taste the same, so try a little water in the cup first.

Try the first step below on its own, taste, then move to the next one only if needed.

ChangeTryWhyWatch for
FirstGrind sizeIncrease: a small step coarserSpeeds up the drawdown and usually reduces extraction.—
DoseDecrease: a gram or two less coffee for the same water, or a splash of hot water in the cupMakes the cup a little weaker. In the one panel study CoffeeHQ has read, bitterness rose with strength and showed no clear link to extraction, so this is worth trying before or beside the grinder.Go too far and the cup turns thin.
AgitationDecrease: pour more gently, avoid stirring the bedLess turbulence reduces the chance of over-extracting fines.—
FilterCheck / reset: check the filter isn't cloggingA slow drain can be a blocked filter or too many fines rather than a grind problem.—
Water temperatureDecrease: a few degrees cooler, especially for darker roastsSlower extraction can soften bitterness.—

When to reset: Check the grinder for excess fines before assuming the recipe alone is the cause.

Full troubleshooting: Coffee tastes too bitterFull troubleshooting: Pour-over brew stalls or drains too slowlyRelated toolRelated tool

Tastes weak

(Kalita Wave)

The brew tastes thin in strength without being clearly sour.

Try the first step below on its own, taste, then move to the next one only if needed.

ChangeTryWhyWatch for
FirstDoseIncrease: add coffee to reach a standard ratioMore coffee for the same water raises strength directly.—
Water amountDecrease: use slightly less total water for the same doseRaises strength without necessarily changing extraction.—
Grind sizeCheck / reset: avoid using grind as the only lever for strengthGrind mainly changes extraction, not strength — dose and ratio are the direct levers.—

When to reset: Adjust dose or ratio via the ratio calculator, then keep grind unchanged until you've re-tasted.

Full troubleshooting: Coffee tastes weak or wateryRelated tool

Want to know why? Strength (intensity), Extraction

Tastes inconsistent

(Kalita Wave)

The cup tastes inconsistent cup to cup, or hollow in the middle of the flavour — often uneven extraction across the coffee bed.

Try the first step below on its own, taste, then move to the next one only if needed.

ChangeTryWhyWatch for
FirstPouring patternCheck / reset: pour in a slow, deliberate spiral covering the whole bedImproves even saturation across the grounds.—
AgitationIncrease: ensure the bloom fully saturates before the first main pourAn incomplete bloom leaves dry pockets that never extract properly.—
Grind sizeCheck / reset: check for a consistent grind, not just the right average sizeA grinder producing a wide mix of fine and coarse particles extracts unevenly regardless of the average setting.—

When to reset: Focus on pouring technique before changing grind, since technique is the more common cause.

Full troubleshooting: Uneven coffee bed after pour-over brewingFull troubleshooting: Grinder produces inconsistent groundsRelated tool
See the full Change the taste guide

Cleaning & maintenance

Rinse the dripper after use; discard the filter and grounds.

None beyond routine cleaning.

Roasts and coffees that suit it

Work out your quantities

Tools for planning a brew with this method, and for adjusting one that did not go to plan.

Techniques for this method

The individual skills this method uses, each with its own adjustments and failure modes.

The whole sequence

Each step links to its own page; this is the order they belong in.

I have coffee and a brewer

You own something to brew with and want a good cup from it.

Find your brewer's page, start from its recipe, and change one thing at a time. The later steps are for when the cup is not right, and for finding out why a change worked.

  1. Find your brewerWhat it does to the coffee, and a starting recipe labelled as a starting point.
  2. Work out the amountsCoffee and water for the cup you are making; the recipe scaler follows from it.
  3. If the cup is not rightChoose the brewer, tick what you noticed: the quickest check, and one change.
  4. One change per brewThe same loop written out for filter coffee, from the first brew to a recipe you keep.
  5. Why the change worksStrength and extraction as two numbers, and what a taste can and cannot tell you.
  6. Test it yourselfHow to compare two cups so the difference is the thing you changed.
  7. See the variables togetherWhat each control moves, side by side, before you touch the next one.

Improve your filter coffee

You brew pour-over or drip and want it to be the same good cup twice.

Filter brewing is forgiving enough that every change is legible, which makes it the best place to learn how the variables behave.

  1. A scaleThe cheapest thing that makes a brew repeatable.
  2. The kettleWhen the spout matters, and when it genuinely does not.
  3. Rinsing the filterTen seconds that do three useful things.
  4. BloomingLetting the gas out before it pushes the water away.
  5. Pulse pouringControlling agitation and contact time with the pour itself.
  6. Dialling inRatio for strength, grind for extraction — kept separate.
  7. Ratio calculatorScale a recipe to whatever you are actually brewing.