Maintenance procedure · Written to ASD-STE100 Issue 9 · Formatted to ANSI Z535

Coffee Machine Descaling

Domestic drip, pod and pump coffee machines — choosing the descaling agent your manufacturer actually permits, running the cycle, and rinsing it out
ApplicabilityDomestic coffee machines with a water tank — drip filter machines, single-serve pod machines and pump espresso machines
Task time47 min to 1 hr 7 min editorial estimate, not a measurement
PersonnelOne
Revisionv1 · 2026-07-29
BEFORE YOU BEGIN

Before you begin. This procedure is general reference information, not professional advice. Equipment varies by manufacturer, model, and year. Always follow the documentation supplied with your equipment — where it differs from this page, follow the manufacturer. Verify that you have the tools, the working conditions, and the ability to do this task safely. If anything is unclear, if the equipment is damaged, or if the task exceeds your experience, stop and use a qualified professional. You are responsible for your own safety and for the outcome. This site accepts no liability for any loss, damage, or injury arising from the use of this information.

Specifications marked unverified could not be traced to a manufacturer source. Do not rely on them — obtain the value from your equipment documentation.

Summary

Limescale builds up inside any machine that heats water, and in a coffee machine it shows up as slower brewing, a cooler drink, a noisier pump and eventually a machine that stops. Descaling is the routine that dissolves it out again. The cycle itself is mostly waiting, takes about fifty minutes including the rinses, and needs no tools at all.

The one decision that matters is which descaling agent to put in, and this is where the manufacturers genuinely contradict each other rather than merely differing in wording. Hamilton Beach tells you to pour plain white vinegar into the reservoir of its coffee makers. De'Longhi says vinegar and the other kitchen-cupboard acids can corrode the machine and leave a taste behind, and tells you to use its own descaler. Breville says to use a shop-bought solution, then gives a vinegar ratio anyway, and finishes by telling you to consult your own manual. This page does not average those three into a house recommendation, because there is no such thing: what one maker publishes as routine maintenance, another publishes as a cause of corrosion. It tells you where to look, and what each maker actually said.

Necessary equipment

ItemNote
Large containerThe container must hold the full quantity of the water tank.
Damp clothFor the outside surfaces of the machine.
Measuring jug optionalThe documentation gives the quantity in a unit that a jug shows.
Descaling agent materialUse only the agent that the documentation for your machine names.
Clean water materialSoft water or filtered water decreases the rate of limescale.

Find the correct descaling agent

Estimated 7 min

NOTEManufacturers do not agree about this agent. One manufacturer gives vinegar and a different manufacturer refuses it.
Descaling agent chemical compatibility
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR YOUR MACHINE BEFORE YOU SELECT A DESCALING AGENT

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

Three tier-1 manufacturer sources contradict each other on this, and the contradiction is direct rather than a difference of wording. Hamilton Beach (hamiltonbeach-coffee-maker-cleaning-faq, accessed 2026-07-29) instructs plain white vinegar in the reservoir of its coffee makers, and gives quantities for it. De'Longhi (delonghi-maintaining-coffee-machine, accessed 2026-07-29) states that DIY home descaling methods such as lemon juice, baking powder or vinegar can incur corrosion and leave behind a lingering aftertaste and residue, and directs the reader to its own lactic-acid descaler. Breville (breville-clean-espresso-machine, accessed 2026-07-29) says you should always use a store-bought espresso cleaning solution, gives a one-part-water to one-part-vinegar ratio for readers who use vinegar anyway, and closes by telling the reader to consult the manual for their own machine because the process varies for each. This page does not choose between them and does not average them. An average of 'use vinegar' and 'never use vinegar' is not a specification. Use the agent named in the documentation for your own machine.
  1. Read the documentation for your coffee machine.
    • The documentation names the descaling agent for your machine.
    • The documentation gives the quantity and the interval.
    3m
NOTICE

READ THE DOCUMENTATION BEFORE YOU SELECT A DESCALING AGENT.
An incorrect agent can cause corrosion in the machine.

  1. Find the descaling agent that your manufacturer names.
    • Hamilton Beach says that plain white vinegar is correct for its machines.
    • De'Longhi refuses vinegar and gives its own descaler.
    • Breville gives a descaling solution from a shop.
    • Use the agent for your own machine only.
    3m
  2. Get the correct descaling agent.
    1m

Prepare the machine

Estimated 4 min

  1. Empty the water tank.
    <1m
  2. Remove the coffee and the used coffee grounds from the machine.
    • Remove the pod from a single-serve machine.
    • Remove the paper filter from a drip machine.
    1m
  3. Read the documentation about the water filter in the machine.
    • Some machines need you to remove the water filter before the cycle.
    2m
  4. Put the large container below the outlet.
    • A drip machine uses its own carafe.
    <1m

Do the descale cycle

Estimated 20 min to 34 min

Descaling agent quantity and dilution
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR THE QUANTITY AND THE DILUTION

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

The quantities the manufacturers publish are not interchangeable, because they belong to different agents in different machines. Hamilton Beach (hamiltonbeach-coffee-maker-cleaning-faq, accessed 2026-07-29) gives one pint of undiluted plain white vinegar for a drip coffee maker, 14 fluid ounces of undiluted vinegar for one single-serve model, and half a cup of vinegar with half a cup of water for another. Breville (breville-clean-espresso-machine, accessed 2026-07-29) gives one part water to one part vinegar. Those are three different concentrations for three different machines from two manufacturers, and none of them is a general rule. This page therefore publishes no quantity of its own.
WARNING

KEEP THE DESCALING AGENT AWAY FROM CHILDREN AND ANIMALS.
The agent is an acid and can cause an injury.

  1. Put the quantity of descaling agent that your documentation gives into the water tank.
    • The quantity is different for each machine and for each agent.
    • Do not use the quantity from a different machine.
    1m
  2. Add the clean water to the level that your documentation gives.
    <1m
NOTICE

DO NOT PUT COFFEE IN THE MACHINE FOR THE DESCALE CYCLE.
The descaling agent makes the coffee unfit to drink.

  1. Start the descale cycle.
    • Some machines have a control for this cycle.
    • Some machines need a usual cycle with no coffee.
    • The documentation gives the method for your machine.
    <1m
WARNING

DO NOT TOUCH THE LIQUID FROM THE MACHINE DURING THE CYCLE.
The liquid is hot and can burn your skin.

  1. Let the machine complete the cycle.
    • Some procedures stop the cycle for a period of some minutes.
    • Do not disconnect the machine during the cycle.
    15m
WARNING

KEEP YOUR HAND AWAY FROM THE STEAM PIPE.
Steam and hot liquid can burn your skin.

  1. If your machine has a steam pipe, do the steam part of the procedure.
    • The documentation gives this part of the procedure.
    • Point the steam pipe into the container.
    2m
  2. Empty the container.
    <1m

Rinse the machine

Estimated 12 min to 16 min

  1. Rinse the water tank with clean water.
    1m
NOTICE

RINSE THE MACHINE AFTER THE DESCALE CYCLE.
Some descaling agent stays in the machine. This agent gives the first drinks a bad taste.

  1. Fill the water tank with clean water.
    <1m
  2. Start a cycle with clean water and no coffee.
    5m
  3. Do the rinse cycle again until the water has no smell of the agent.
    • Hamilton Beach gives two or three rinse cycles for its machines.
    • Empty the container after each cycle.
    5m

Complete the work

Estimated 6 min

Descaling interval
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR THE DESCALING INTERVAL

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

The two manufacturers that publish an answer publish two different kinds of answer. Hamilton Beach (hamiltonbeach-coffee-maker-cleaning-faq, accessed 2026-07-29) gives a fixed schedule: monthly for a machine used daily, and at least once a month or once a week in a hard water area for another of its models. De'Longhi (delonghi-maintaining-coffee-machine, accessed 2026-07-29) gives no fixed schedule at all and instead tells the reader to test the water hardness and set the machine to the correct level so that the machine itself raises the alert. Water hardness is the variable underneath both answers, which is why neither of them transfers to a machine in a different house.
  1. Rinse the container and the carafe.
    1m
  2. Clean the outside of the machine with a damp cloth.
    2m
  3. Discard the first drink after the descale procedure.
    • A bad taste in this drink shows that the machine needs more rinse cycles.
    2m
  4. Record the date of the descale.
    • A record of the date shows when the next descale is due.
    1m

Terminology

This page uses one term for each item and holds it throughout, as ASD-STE100 requires. Equipment sellers and other guides use the names below for the same parts.

descaling
Also called: descale, decalcify, delime, clean my coffee maker, clean my Keurig, run the clean cycle, limescale removal
limescale
Also called: scale, calcium buildup, hard water deposits, the white crust, chalk, mineral buildup
descaling agent
Also called: descaler, descaling solution, coffee machine cleaner, vinegar, citric acid, cleaning solution
water tank
Also called: reservoir, water reservoir, water container, the tank, water well
steam pipe
Also called: steam wand, frothing wand, milk frother, the metal tube

When to use a professional

Do not use a descaling agent that the documentation for your machine does not name. De'Longhi says that vinegar and the other home acids can cause corrosion.

Stop if the machine shows the descale message again after two full procedures. A blockage that stays is not part of this procedure. Speak to the manufacturer.

Stop if liquid flows from the body of the machine. Disconnect the machine from the power supply. Speak to the manufacturer.

Do not open the body of the machine. Only a qualified technician must do work inside a coffee machine.

Common questions

Can I descale my coffee maker with vinegar?

It depends entirely on who made it, and this is the one question on the topic where the manufacturers flatly contradict each other. Hamilton Beach tells you to pour plain white vinegar into the reservoir of its coffee makers and gives quantities for it. De'Longhi says the opposite: that DIY methods such as lemon juice, baking powder or vinegar can incur corrosion and leave behind a lingering aftertaste and residue of their own, and points you at its own descaler instead. Breville sits in between, saying you should always use a store-bought espresso cleaning solution but giving a vinegar ratio anyway. We are not going to pick a winner, because the answer is a property of your machine and not of the question. Read what your maker says and do that.

How often should I descale a coffee machine?

Hamilton Beach gives a calendar: monthly for a machine used every day, and as often as weekly in a hard water area for one of its models. De'Longhi gives no calendar at all and instead tells you to test your water hardness, set the machine to the right level and let the machine tell you. Both are reasonable, and the reason they differ is that the real variable is your water rather than your machine. If your water leaves white marks in the kettle, descale more often than any schedule says.

How much vinegar or descaler do I use?

Whatever your own documentation says, and this page deliberately prints no general figure. Hamilton Beach alone gives three different answers for three of its own machines: one pint of undiluted white vinegar for a drip maker, 14 ounces of undiluted vinegar for one single-serve model, and half a cup of vinegar with half a cup of water for another. Breville gives one part water to one part vinegar. Those are different concentrations for different machines, so there is no number here that would be safe to copy across.

What happens if I use the wrong descaler?

De'Longhi is the manufacturer that states the case most directly: its concern with the kitchen-cupboard acids is corrosion inside the machine, plus an aftertaste and a residue that stay behind afterwards. That is the claim this page can stand behind, because it is what De'Longhi actually publishes. What we will not tell you is how your own warranty treats it, because that is a question for your warranty document and your maker, not for us. If the machine is still under warranty, the named product is the safe choice for that reason alone.

Why is my coffee maker slow, or why does it stop part way through?

Limescale is the usual reason on any machine more than a year or two old, especially in a hard water area. The deposit narrows the water path and coats the heating element, so the machine takes longer, delivers less, and runs cooler. Machines with a descale warning light will usually have been asking for a while by the time you notice the symptom.

Do I need to descale if I use filtered or bottled water?

Less often, but not never. Filtering reduces the minerals that form scale rather than eliminating them, which is why De'Longhi recommends its own water filter specifically as a way to lengthen the gap between descales rather than to remove the need. Keep to whatever interval your documentation gives and treat filtered water as a bonus.

How do I know when I have rinsed it enough?

Smell and taste. Hamilton Beach's own guidance for its machines is two to three full cycles of cold tap water after the vinegar, and that is a reasonable floor for any machine. Keep going until there is no smell of the descaling agent in the water, then make one drink and throw it away. If that drink still tastes wrong, rinse again.

Sources

Every specification on this page is traced to one of these sources. Tier 1 is a manufacturer document, a published standard, or a government safety authority. See Standards for the full tiering rule.

  1. Tier 1Hamilton Beach FAQs - coffee maker cleaning and descalingHamilton Beach Brands, Inc. · accessed 2026-07-29 · re-verification due 2027-01-25
  2. Tier 1Maintaining Your Coffee Machine for the Best BrewDe'Longhi Appliances S.r.l. (De'Longhi US) · accessed 2026-07-29 · re-verification due 2027-01-25
  3. Tier 1How to Clean an Espresso Machine: A Step by Step GuideBreville USA, Inc. · accessed 2026-07-29 · re-verification due 2027-01-25

Revision history

Current version 1 · updated 2026-07-29 · next review due 2027-07-29

  1. v1 · 2026-07-29First draft. Sourced to Hamilton Beach, De'Longhi and Breville support documentation. No value publishes as verified. The descaling agent, its quantity and the interval all publish as consult-the-manufacturer, and the agent carries a direct three-way contradiction between the named manufacturers rather than a house recommendation.

Corrections to this page are listed in the public corrections log. Reports that are credible and not yet verified are listed in the public errata register, and an open one renders above the step it concerns.

Comments and corrections

Found an error? A correction with a manufacturer source is applied and logged publicly. You can also write to corrections@fixchecklist.com.

Every step above carries its own report control, which tags the report with that step so a correction reaches the right place. For anything about the procedure as a whole — the order of the sections, a step that is missing, something that did not match your equipment — use this: report something about this whole procedure.

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