Chemex Brewing Guide

The Chemex is a pour-over coffee brewer that combines the brewing vessel and serving carafe in one piece.

Its cone-shaped design and thick paper filters commonly produce a clean, light-bodied cup with fewer fine particles and less visible coffee oil than metal-filtered brewing methods.

The method requires controlled pouring, but the routine does not need to become overly complicated. Begin with a consistent coffee-to-water ratio, an appropriate grind and a simple pouring structure. Once the basic recipe becomes repeatable, individual variables can be adjusted gradually.

The Chemex differs from many other manual brewers because it functions as both:

• A pour-over brewer
• A serving carafe

Its design commonly includes:

• A glass body
• A cone-shaped upper section
• A narrow central neck
• A wider lower serving chamber
• A pouring channel
• Thick paper filters
• A wooden collar or handle on some models

The thick filter removes much of the fine sediment and coffee oil that may pass through thinner paper or metal filters.

This can create:

• A clean cup
• Light body
• Clear flavour separation
• A soft finish
• Less visible sediment
• A coffee style suited to shared serving

The Chemex may suit you when:

• You prefer clean and light-bodied coffee
• You regularly prepare more than one cup
• You enjoy a controlled pour-over process
• You want to brew and serve from the same vessel
• You have access to compatible filters
• You can store and handle a glass brewer safely

A practical Chemex setup may include:

• Chemex brewer
• Compatible Chemex filter
• Kettle
• Coffee
• Grinder
• Scale
• Timer
• Coffee storage
• Cleaning brush
• Serving cups

The essential starting setup is:

• Brewer
• Correct filter
• Ground coffee
• Hot water
• Serving cups

A grinder, scale and gooseneck kettle improve consistency and control, but the brewing routine can be developed gradually.

The complete setup requires more space than the glass brewer alone.

Allow room for:

• Filter storage
• Kettle placement
• Coffee preparation
• Scale use
• Pouring
• Safe glass handling
• Drying after cleaning

Chemex brewers are available in several capacities.

The best size depends on:

• How many people regularly drink coffee
• How much coffee is prepared at one time
• Whether the brewer is used for individual or shared servings
• Available storage space
• Kettle capacity
• Filter compatibility
• How comfortably the glass can be handled

Chemex filters are a central part of the brewing system.

They are generally thicker than many standard pour-over filters and are designed to fit the brewer’s cone.

The filter affects:

• Flow rate
• Brewing time
• Cup clarity
• Coffee body
• Sediment
• Oil retention
• Cleanup

Compatible filters may be available as:

• Pre-folded filters
• Unfolded filter sheets
• Square filters
• Circular filters
• Bleached paper
• Natural paper

Before buying filters, check:

• Chemex model
• Brewer capacity
• Recommended filter format
• Local availability
• Pack quantity
• Storage requirements
• Ongoing cost

Do not assume that a standard cone filter will perform the same way as a Chemex filter.

The filter should create a stable brewing cone while leaving the brewer’s pouring channel open.

When using a folded Chemex filter:

1. Open the filter into a cone.
2. Identify the side containing several paper layers.
3. Position the thicker side against the pouring channel.
4. Make sure the filter reaches the bottom of the cone.
5. Check that the filter does not completely seal the air channel.
6. Rinse the filter before adding coffee.

The thicker side supports the filter near the pouring area and helps prevent collapse.

If the filter seals the pouring channel completely, air may struggle to escape from the lower chamber.

This can cause:

• Slower drainage
• Irregular bubbling
• Filter movement
• A partially blocked brew
• An inconsistent flow rate

Rinsing the filter helps prepare both the paper and the glass brewer.

It may:

• Warm the Chemex
• Help the filter hold its shape
• Remove loose paper particles
• Reduce paper aroma
• Preheat the serving chamber
• Confirm that the filter is positioned correctly

To rinse:

1. Place the filter inside the Chemex.
2. Pour hot water across the full paper surface.
3. Allow the water to drain into the lower chamber.
4. Hold the filter in place.
5. Pour the rinse water out through the pouring channel.
6. Return the Chemex to the scale.
7. Add the ground coffee.

Pour out the rinse water without removing or disturbing the filter.

Chemex can be used with different coffees and roast levels.

Its thick filtration can work particularly well with coffees where you want to notice:

• Clear flavour separation
• Floral qualities
• Fruit-like notes
• Soft sweetness
• Bright acidity
• Delicate aromatics
• A clean finish

Medium and darker roasts can also be brewed successfully.

The recipe may need to change according to:

• Roast level
• Coffee age
• Bean density
• Batch size
• Grinder performance
• Preferred strength
• Water temperature

Choose coffee according to the flavours you enjoy rather than treating Chemex as a method reserved for one roast style.

A medium to medium-coarse grind is a practical starting point for many Chemex recipes.

The grind is commonly coarser than a starting V60 grind because:

• Chemex filters are thick
• Larger batches are common
• The coffee bed may be deeper
• The total brewing time is often longer
• Water can drain more slowly

The correct grind depends on:

• Coffee dose
• Water quantity
• Chemex size
• Filter
• Number of pours
• Pouring speed
• Coffee type
• Grinder
• Desired brewing time

A finer grind creates more resistance and usually slows the drawdown.

A coarser grind creates less resistance and usually speeds the flow.

Adjust gradually and keep the remaining recipe stable.

A practical starting range for Chemex is approximately:

• 1 gram of coffee for every 15 to 17 grams of water

A 1:16 ratio provides an easy starting point.

Examples include:

• 20 grams coffee with 320 grams water
• 25 grams coffee with 400 grams water
• 30 grams coffee with 480 grams water
• 35 grams coffee with 560 grams water
• 40 grams coffee with 640 grams water
• 50 grams coffee with 800 grams water

Use more coffee or less water for a stronger cup.

Use less coffee or more water for a lighter cup.

When preparing a larger batch, avoid adjusting ratio, grind and pouring pattern at the same time.

Keep the ratio stable and adjust the grind first when the flow needs correction.

Do not fill the brewer beyond a comfortable working level.

The coffee and water should remain below the filter edge throughout brewing.

A dose that is too large can create:

• A very deep coffee bed
• Slow drainage
• Limited pouring space
• Increased risk of overflow
• Difficult agitation control
• Longer brewing time

A dose that is too small for a large Chemex may create:

• A shallow coffee bed
• Faster drainage
• More heat loss
• Less stable pouring
• A routine that feels awkward for the brewer size

Choose a recipe that works naturally with the selected model.

A scale supports a repeatable Chemex recipe.

It allows you to measure:

• Coffee dose
• Bloom water
• Water added during each pour
• Total water
• Coffee-to-water ratio
• Changes between batches

The scale needs enough capacity to support:

• The Chemex
• Coffee
• Water
• The final brewed batch

A larger Chemex filled with coffee may exceed the limit of a very small coffee scale.

Check:

• Weight capacity
• Platform size
• Display visibility
• Timer function
• Stability beneath the glass base
• Resistance to water spills

A separate timer can be used when the scale does not include one.

A practical starting water range for Chemex is approximately:

• 92–96°C

The most suitable temperature may depend on:

• Roast level
• Coffee density
• Grind size
• Brewing time
• Batch size
• Desired flavour
• Water quality

A lighter roast may respond well to hotter water.

A darker roast may benefit from a slightly cooler starting point when the cup tastes harsh or overly bitter.

When using a kettle without temperature control, bring the water to a boil and allow it to rest briefly before pouring.

Keep the temperature approach consistent while evaluating other variables.

Water affects both flavour and maintenance.

Use water that:

• Tastes pleasant
• Has no strong odour
• Does not leave excessive mineral scale
• Is suitable for drinking
• Remains reasonably consistent between brews

Very hard water can:

• Leave scale inside the kettle
• Affect coffee flavour
• Change extraction
• Increase cleaning frequency

Highly purified or distilled water may also produce an unbalanced result when it lacks the mineral content normally involved in extraction.

Begin with pleasant household drinking water and make further adjustments only when there is a clear need.

A gooseneck kettle is particularly useful for Chemex because it supports controlled pouring over a larger coffee bed.

It can help manage:

• Pouring speed
• Water placement
• Circular movement
• Bloom saturation
• Pulse pours
• Water level
• Larger batch control

When choosing a kettle, consider:

• Water capacity
• Gooseneck design
• Electric or stovetop heating
• Temperature control
• Heating speed
• Handle comfort
• Weight when full
• Pouring balance
• Counter space
• Cleaning access

For larger Chemex recipes, make sure the kettle holds enough water for:

• Filter rinsing
• Preheating
• Brewing

A kettle that is too small may need to be refilled during the brew, interrupting the process.

Arrange the complete setup before beginning.

A simple sequence is:

1. Place the Chemex on the scale.
2. Insert the filter.
3. Position the thick filter side against the pouring channel.
4. Rinse the filter.
5. Discard the rinse water.
6. Measure the coffee.
7. Grind the coffee.
8. Add the coffee to the filter.
9. Gently level the coffee bed.
10. Tare the scale.
11. Prepare the timer.
12. Begin the bloom.

Preparing in advance prevents unnecessary pauses once water is moving through the coffee.

A practical starting recipe is:

• 30 grams coffee
• 480 grams water
• Medium-coarse grind
• Water around 92–96°C
• Approximately 60–90 grams bloom water
• Bloom time around 40–45 seconds
• Two or three main pours
• Total brewing time around 4:00–5:30

The exact brewing time varies according to:

• Dose
• Grind
• Filter
• Coffee
• Number of pours
• Pouring speed
• Agitation
• Grinder

Use the recipe as a stable starting framework rather than a fixed rule.

Heat enough water for:

• Rinsing the filter
• Preheating the Chemex
• Brewing the full recipe

Allow extra water so the kettle does not become empty during the final pour.

Place the filter inside the Chemex with the thicker layered side against the pouring channel.

Rinse the complete paper surface with hot water.

Discard the rinse water while keeping the filter in place.

Measure the selected coffee dose.

Grind to a medium or medium-coarse starting point.

Add the coffee and gently level the bed.

Place the Chemex on the scale and reset it to zero.

Prepare the timer before beginning the first pour.

Start the timer and pour approximately two to three times the coffee dose in water.

For 30 grams of coffee, use approximately 60–90 grams of water.

Pour across the coffee so the grounds become evenly wet.

Allow the bloom to continue for approximately 40–45 seconds.

Pour slowly and evenly in controlled circular movements.

Avoid pouring continuously against the filter wall.

Keep the water level below the filter edge.

Add the remaining water in two or three controlled pours.

Allow the water level to fall slightly between stages without letting the coffee bed become completely dry.

Continue until the scale reaches the total recipe weight.

Allow the remaining water to pass through the coffee.

Do not press, squeeze or disturb the filter.

Remove the filter when the flow slows to a light drip.

Gently swirl the Chemex to combine the brewed coffee.

Pour into preheated cups and allow the coffee to cool slightly before evaluating the flavour.

The bloom is the first controlled addition of water.

It helps:

• Wet the coffee evenly
• Release trapped gas
• Prepare the coffee bed
• Reduce dry pockets
• Create a more stable main pour

A practical bloom amount is approximately:

• Two to three times the coffee weight

Examples include:

• 20 grams coffee: 40–60 grams water
• 30 grams coffee: 60–90 grams water
• 40 grams coffee: 80–120 grams water
• 50 grams coffee: 100–150 grams water

Very fresh coffee may release more gas and require slightly more bloom time.

Use a gentle swirl or stir only when parts of the coffee remain visibly dry.

A Chemex recipe can use different pouring structures.

During pouring:

• Keep the stream controlled
• Wet the coffee evenly
• Use calm circular movement
• Avoid pouring only in the centre
• Avoid pouring continuously against the paper
• Keep the kettle at a comfortable height
• Avoid flooding the filter
• Maintain a repeatable rhythm
• Keep the air channel open

A strong and high pour can create excessive agitation.

A very weak pour may extend the brewing time and lose heat.

Aim for a controlled flow that keeps the coffee bed evenly saturated.

The Chemex pouring channel allows air to move out of the lower chamber as brewed coffee enters.

If the filter collapses tightly against the channel, drainage may slow or become irregular.

Check that:

• The thicker filter side faces the channel
• The filter does not completely seal the glass
• The paper remains stable
• Air can move out of the lower chamber
• Coffee does not collect inside the channel
• The filter does not shift during pouring

If the brew suddenly slows, inspect the filter position before immediately changing the grind.

Agitation may be created by:

• Pouring
• Stirring
• Swirling
• Pouring from greater height
• Using a stronger stream
• Moving the Chemex

Some agitation helps wet the coffee evenly.

Too much agitation can:

• Move fine particles against the filter
• Slow the drawdown
• Increase extraction unpredictably
• Create an uneven coffee bed
• Make the recipe harder to repeat

A gentle swirl during the bloom or after the final pour may be enough.

Avoid adding several stirring and swirling steps unless they solve a specific problem.

A practical starting range for many Chemex recipes is approximately:

• 4:00–5:30

Larger batches may take longer.

Total time depends on:

• Coffee dose
• Water quantity
• Grind size
• Filter
• Coffee
• Number of pours
• Pouring speed
• Agitation
• Grinder
• Filter position

Do not force every batch to finish within the same exact time.

Use time to compare similar recipes and identify major flow changes.

Taste remains more important than the timer alone.

After the brew drains, observe the coffee bed.

A relatively level bed may indicate that water was distributed evenly.

A heavily sloped or cratered bed may result from:

• Uneven pouring
• Pouring too strongly in one area
• Excessive agitation
• Pouring against the filter
• Moving the Chemex during brewing
• An unstable scale or surface

The bed appearance does not independently prove whether the coffee is good.

Use it together with:

• Taste
• Brewing time
• Flow
• Grind setting
• Pouring notes

Coffee may taste weak, sharp or underdeveloped when extraction is too low.

Possible signs include:

• Thin body
• Short finish
• Sharp acidity
• Limited sweetness
• Hollow flavour
• Fast drainage
• Short brewing time

Try one adjustment at a time:

• Grind slightly finer
• Use slightly hotter water
• Pour more slowly
• Extend the brewing time
• Add gentle agitation
• Use slightly more coffee
• Reduce the final water quantity

Begin with grind size when the flow is clearly fast.

Coffee may taste bitter, harsh or drying when extraction is too high.

Possible signs include:

• Heavy bitterness
• Dry finish
• Muted sweetness
• Harsh aftertaste
• Slow drainage
• Unusually long brewing time
• Water remaining high in the filter

Try one adjustment at a time:

• Grind slightly coarser
• Use slightly cooler water
• Pour more quickly
• Reduce agitation
• Shorten the brewing time
• Use slightly less coffee when the cup is overly strong
• Increase the water quantity slightly

Dark-roasted coffee may respond well to a lower temperature and shorter overall contact time.

Slow drainage may result from:

• Grind that is too fine
• Excessive agitation
• A very large coffee dose
• Too many pulse pours
• Fine particles from the grinder
• A collapsed filter
• A blocked pouring channel
• Water poured too slowly
• Coffee sitting unevenly in the filter

Try:

1. Checking the filter position
2. Confirming that the pouring channel is open
3. Grinding slightly coarser
4. Reducing unnecessary agitation
5. Simplifying the pouring structure
6. Reducing the dose when the brewer is crowded

Do not assume that grind is always the only cause.

Fast drainage may result from:

• Grind that is too coarse
• A low coffee dose
• A very shallow coffee bed
• Fast aggressive pouring
• Too little total water contact
• A recipe that is too small for the brewer

Try:

• Grinding slightly finer
• Pouring more slowly
• Using a suitable dose for the Chemex size
• Adding one controlled pour stage
• Increasing the coffee dose while preserving the ratio
• Reducing bypass along the paper wall

Change one variable at a time.

A larger batch generally requires:

• More coffee
• More water
• A larger Chemex
• More kettle capacity
• A coarser grind
• More controlled pouring
• A longer brewing time
• A stable scale
• Careful handling when full

As the dose increases:

• The coffee bed becomes deeper
• Water may drain more slowly
• Heat retention may improve
• Fine particles may create more resistance
• The filter may approach capacity
• The final Chemex becomes heavier

Do not simply multiply a small recipe without observing how the brewer behaves.

Make gradual changes and maintain enough room above the slurry.

A smaller batch in a large Chemex may:

• Drain quickly
• Lose heat
• Create a shallow coffee bed
• Make controlled pouring harder
• Produce less consistent extraction

To support a smaller batch:

• Use an appropriate Chemex size when possible
• Grind slightly finer if the flow is very fast
• Pour gently
• Preheat the brewer thoroughly
• Keep the ratio consistent
• Avoid excessive pauses
• Use a stable cup volume

When one small cup is the normal routine, V60 may sometimes provide a more practical workflow than a large Chemex.

The Chemex is designed to move from brewing to serving.

Before pouring:

• Remove the used filter
• Gently swirl the coffee
• Hold the glass securely
• Support the wooden collar or handle
• Make sure the pouring channel is clear
• Use preheated cups when desired
• Pour slowly

Swirling helps combine the brewed coffee because the first and final portions may have slightly different concentrations.

Do not leave the used filter sitting above the brewed coffee after drainage is complete.

The Chemex is made from glass and does not actively heat the brewed coffee.

To support heat retention:

• Rinse the brewer with hot water
• Preheat the serving cups
• Brew an appropriate batch size
• Avoid unnecessary pauses
• Serve soon after brewing
• Use an insulated cover only when it is safe and appropriate
• Transfer coffee to a thermal server when longer holding is required

Do not place the Chemex on direct heat unless the specific model and manufacturer instructions clearly permit it.

Glass can be damaged by inappropriate heating or sudden temperature changes.

The Chemex requires careful handling during:

• Brewing
• Serving
• Cleaning
• Drying
• Storage

Avoid:

• Hitting the glass against the sink
• Placing it near the counter edge
• Pouring onto an unstable surface
• Holding only the narrow neck when full
• Exposing hot glass to sudden cold water
• Storing heavy objects above it
• Using abrasive tools
• Allowing the wooden collar to remain wet

Inspect the brewer periodically for:

• Cracks
• Chips
• Loose components
• Damage around the rim
• Changes near the base

A damaged glass brewer should not be used.

After brewing:

1. Remove the paper filter and grounds.
2. Dispose of them according to the local waste system.
3. Rinse the Chemex with warm water.
4. Wash away visible coffee residue.
5. Clean the lower chamber.
6. Rinse the pouring channel.
7. Allow the glass to dry completely.

Use a soft bottle brush when the lower chamber is difficult to reach.

Avoid tools that can scratch or strike the glass.

Coffee oils and residue can collect:

• Around the neck
• Inside the lower chamber
• Near the pouring channel
• Beneath the wooden collar
• Around the rim

Periodic deeper cleaning helps preserve clarity and prevent odour.

Some Chemex models include a wooden collar secured with a leather tie.

The collar should normally remain dry.

When cleaning:

• Remove the collar when appropriate
• Avoid soaking the wood or leather
• Wipe the components gently
• Allow them to dry completely
• Do not reinstall them while wet
• Check that the tie remains secure
• Follow the manufacturer’s care instructions

The glass brewer can then be washed more thoroughly without saturating the wooden components.

A Chemex may be stored:

• Inside a protected cabinet
• On a stable open shelf
• At the back of a deep counter
• Near the brewing equipment
• In a dedicated coffee cabinet

Keep it:

• Away from counter edges
• Away from heavy stacked items
• Upright
• Completely dry
• Protected from impact
• Clear of crowded shelves
• Easy to lift without catching nearby objects

Filters should be stored:

• In a dry location
• Protected from strong odours
• Inside their packaging or a clean container
• Near the brewer
• Away from moisture and steam

The setup should remain accessible enough for regular use without leaving the glass vulnerable to damage.

Standard cone filters may not fit or perform like Chemex filters.

Use a filter designed for the brewer.

If the layered side does not support the pouring channel, the filter may collapse and restrict airflow.

Place the thicker side against the channel.

Rinse water left inside the Chemex dilutes the final coffee.

Remove it before adding the ground coffee.

A very fine grind can create a long, stalled brew.

Begin with a medium to medium-coarse setting.

Repeated pulse pouring can extend brewing time and increase agitation.

Begin with two or three main pours.

Water added directly along the paper may bypass part of the coffee bed.

Keep most of the water over the coffee.

A sealed channel can slow drainage and create irregular bubbling.

Check the filter position before brewing.

A large brewer may be inconvenient for one small daily cup.

Match the size to normal use.

Remove the filter after the drawdown finishes.

Do not leave the wet grounds sitting above the brewed coffee.

A large Chemex becomes heavy when filled with coffee.

Support it securely while serving.

Changing grind, ratio, water temperature and pouring structure together makes the result difficult to understand.

Adjust one variable at a time.

Use:

• 30 grams coffee
• 480 grams water
• Medium-coarse grind
• Water around 92–96°C
• 75 grams bloom water
• 45-second bloom
• Three main pours
• Total brewing time around 4:00–5:30

Method:

1. Position the filter correctly.
2. Rinse the filter and preheat the Chemex.
3. Discard the rinse water.
4. Add 30 grams of ground coffee.
5. Gently level the coffee bed.
6. Start the timer.
7. Pour to 75 grams.
8. Allow the coffee to bloom until approximately 45 seconds.
9. Pour gradually to approximately 220 grams.
10. Allow the water level to fall slightly.
11. Continue pouring to approximately 350 grams.
12. Complete the final pour to 480 grams.
13. Allow the coffee to drain.
14. Remove the filter.
15. Gently swirl the Chemex and serve.

Use the recipe as a stable starting point.

Adjust the grind first when the brewing time or flavour needs correction.

Before brewing, check that:

• The Chemex size suits the batch
• The correct filters are available
• The filter is folded and positioned correctly
• The thicker filter side faces the pouring channel
• The air channel remains open
• The filter has been rinsed
• Rinse water has been discarded
• The coffee dose has been measured
• The grind is within a medium to medium-coarse starting range
• The water quantity has been measured
• Water temperature is appropriate
• The kettle contains enough water
• The scale can support the filled Chemex
• The timer is ready
• The coffee bed is level
• Bloom water wets all the coffee
• The main pour remains controlled
• Water stays below the filter edge
• Only one variable is adjusted between test brews
• The used filter is removed after brewing
• The coffee is swirled before serving
• The glass brewer is cleaned and dried safely
• Filters are stored in a dry location
• The complete routine fits ordinary daily use

A reliable Chemex brew comes from an appropriate batch size, a stable grind and a simple pouring structure rather than an unnecessarily complicated recipe.

Is Chemex difficult for beginners?

Chemex requires controlled pouring, but the basic routine can remain straightforward. Begin with one coffee-to-water ratio, a medium-coarse grind, a bloom and two or three main pours. Repeat the same recipe before changing individual variables.

What grind size should I use for Chemex?

A medium to medium-coarse grind is a practical starting point. Grind slightly finer when the brew drains too quickly and tastes weak. Grind slightly coarser when drainage is very slow or the coffee tastes harsh and dry.

What coffee-to-water ratio should I use for Chemex?

A ratio between approximately 1:15 and 1:17 can provide a useful starting range. A 1:16 ratio is simple to repeat. For example, 30 grams of coffee can be paired with 480 grams of water.

Why are Chemex filters thicker?

The thick paper helps retain more fine particles and coffee oils, contributing to the clean and light-bodied cup associated with Chemex brewing. It also creates more flow resistance than many thinner pour-over filters.

Can I use regular coffee filters in a Chemex?

Standard filters may not fit the brewer correctly or provide the same flow and filtration. Use filters designed for the specific Chemex model and capacity.

Do I need a gooseneck kettle for Chemex?

A gooseneck kettle is not essential, but it makes pouring speed and water placement easier to control. It becomes especially useful when preparing larger batches or using staged pours.

Why is my Chemex draining too slowly?

The grind may be too fine, the dose may be too large, the filter may have collapsed over the pouring channel or excessive agitation may have moved fine particles against the paper. Check the filter position before changing the grind.

How long should Chemex brewing take?

Many Chemex recipes finish in approximately four to five and a half minutes. Larger doses may require more time. Use brewing time as a diagnostic guide rather than forcing every coffee to reach one exact number.

Can Chemex coffee stay warm in the brewer?

The glass retains some heat but does not actively warm the coffee. Preheating the Chemex and serving cups can help. When coffee needs to remain warm for longer, transfer it to an appropriate thermal server.

Is Chemex suitable for one person?

A smaller Chemex can suit one person, particularly when several cups are consumed from one batch. A large model may be inconvenient when only one small cup is prepared regularly.