How to Descale an Espresso Machine: Safe Step-by-Step

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Comparison table

Our picks in detail

1

Urnex Dezcal Descaling Powder

Best for: General-purpose descaling when your machine allows a powder

A powdered descaler for coffee and espresso equipment. It is a straightforward choice when you want a dedicated scale remover and your machine manual is comfortable with powder formulas.

Because it is a powder, it needs to be dissolved fully before use. That makes it more flexible than a single-dose liquid, but also a little more hands-on.

Format

Powder

Manufacturer mix ratio

200 g per 3.9 L warm water

Product type

Coffee and espresso machine descaler

Pros

• Made for coffee equipment
• Flexible powder format for different reservoir sizes
• Clear manufacturer mixing directions

Cons

• Must dissolve fully
• More prep than a liquid
• Still has to match your machine's manual

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2

durgol swiss espresso

Best for: Simple, ready-to-pour descaling with minimal mixing

A liquid coffee-machine descaler that keeps the process simple with a single measured dose.

Good if you prefer a ready-to-use formula and your espresso machine accepts a third-party descaler.

Format

Liquid

Manufacturer dose

125 ml per full descale

Product type

Coffee-machine descaler

Pros

• Easy portioning
• No powder to dissolve
• Designed for coffee machines

Cons

• Must still be compatible with the machine
• Less flexible than powder if you need a custom amount
• Rinse cycles still matter

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What descaling actually does

Scale is the mineral buildup left behind when water moves through the machine. Over time it can narrow internal passages, reduce steam output, and make the pump work harder.

Descaling dissolves that buildup. It does not clean coffee oils from the brew path, and it does not fix grinder, puck, or temperature problems. That is why descaling and backflushing are separate maintenance jobs.

• Slower water flow or weaker steam can point to scale.
• A descale light or maintenance alert should not be ignored.
• Filtered water helps, but it does not stop scale forever.
• A machine can need both descaling and routine cleaning.

How to descale an espresso machine

The exact buttons vary by brand, but the safe sequence is nearly always the same.

Before you start

Read the manual and confirm the approved descaler. If your machine has a water filter, remove it first if the manual says to. Empty the tank, drip tray, and portafilter, then let the machine cool.

Keep the machine on a dry counter and clear the area around the steam wand and hot water outlet.

• Use only the cleaner the manual allows.
• Remove any water filter before you start.
• Empty removable parts.
• Let hot parts cool before handling them.

Run the cycle

Mix the descaler exactly as directed and fill the reservoir. Start the machine's descale program if it has one, or follow the manual's flush instructions.

• Run solution through the brew path as directed.
• If the machine routes solution through the steam wand, follow the sequence the manual gives.
• Do not shorten or skip any pause or flush steps the machine requests.
• Never point a hot wand toward your hand or face.

Rinse thoroughly

When the descaling step ends, empty the tank and run fresh water through the machine until the rinse cycles are complete. Many machines need more than one tank of clean water.

Reinstall or replace the water filter only after rinsing is done. Wipe down the exterior, then make one normal water run before pulling espresso again.

• Run every rinse cycle the manual calls for.
• Flush the steam wand and hot water outlet if instructed.
• Check for lingering odor before brewing coffee.
• Put the machine back together only when the tank is clean.

What not to use

The most common mistake is treating every cleaner as interchangeable. It is not.

Vinegar, bleach, dish soap, and abrasive cleaners are not safe defaults for an espresso machine. Backflush detergent is also the wrong product for the water tank.

• Skip vinegar unless the manual explicitly allows it.
• Never use bleach or dish soap in the reservoir.
• Do not put backflush detergent in the water tank.
• Do not mix two cleaners together.
• Do not descale with the water filter still installed unless the manual says to.

When a brand is specific

Some manufacturers are strict about the formula they want. De'Longhi, for example, says to use EcoDecalk only and warns against acetic- and sulphamic-based descalers.

When the brand names a product, that instruction beats generic internet advice.

• Follow the manual first.
• Use brand-specific cleaner if the maker requires it.
• Stop and rinse again if the machine still smells like cleaner after the first rinse.

How often to descale

There is no universal calendar for descaling. Water hardness, shot volume, machine size, and whether you use filtered water all change the schedule.

The best rule is to follow the machine's reminder or manual first, then shorten the interval if you live with hard water or notice slower flow. If you are comparing easier-maintenance machines, our Best Espresso Machine for Beginners guide is a good place to start.

• Descale when the machine asks, not just when espresso tastes off.
• Use filtered or softened water only if the manual allows it.
• Keep a note of the last descale.
• Replace the water filter on schedule.

Signs it is time

Common hints include slower flow, weaker steam, a longer warm-up, or a descale prompt on the display.

• Slow shots can point to mineral buildup.
• Weaker steam can mean the water path is restricted.
• A maintenance light should be treated as a reminder, not a nuisance.
• Hard water usually means a shorter interval.

If descaling does not fix the problem

If a proper descale and rinse do not solve the problem, scale was only part of the issue.

Look next at grind size, dose, tamp, basket cleanliness, shower screen buildup, and general machine health. If shot flow is also off, revisit How to Dial In Espresso before blaming the cleaner.

• Slow shots after descaling can point to grind or puck prep.
• Weak steam can mean the wand needs purging or cleaning.
• Persistent error codes need the manual or service support.
• Bad taste after rinsing often means more flush cycles are needed.

Buying guide

Choose the right descaler

The safest option is the one your manual names. If the brand does not specify one, choose a product made for coffee equipment and follow its dilution directions exactly.

Urnex Dezcal Descaling Powder and durgol swiss espresso are two common US options. The first is a powder; the second is a liquid. Both are designed for coffee machines, but neither should override your machine's own instructions.

• Brand-approved first.
• Powder if you want flexible measuring.
• Liquid if you want simple dosing.
• Avoid generic acids meant for kitchens or bathrooms.

Powder vs liquid

Powder can be handy if you want to mix only what you need, but it has to dissolve fully. Liquid is simpler to pour, but you still need to match the dose to the machine.

• Powder gives you flexibility.
• Liquid gives you convenience.

Match the process to the machine type

Super-automatic machines often have a guided descale mode. Semi-automatic machines may need a brew-path descale plus a separate backflush if the machine supports it. Machines with a removable filter need that filter removed first.

• Super-automatic: follow prompts exactly.
• Semi-automatic: use the descale routine, then clean the brew path separately if supported.
• Dual boiler or heat exchanger: follow the manual for every circuit it names.
• Manual machines without a descale program: follow the fill-and-flush instructions from the manual.

Do not guess the steps

If the manual calls for holding buttons, waiting for a flush, or turning a knob at a certain point, do exactly that. The cycle is part of the safety and rinse process.

• Use the machine's built-in program when available.
• Do not improvise the order of the cycle.

Protect the parts that matter

Descaler should live in the water path, not on decorative panels, rubber seals, or countertops. Wipe spills quickly with clean water and dry the area.

Hot water, steam, and metal surfaces can burn, so give the machine time to cool before touching the wand, drip tray, or brew head.

• Remove the water filter.
• Empty the drip tray and tank.
• Do not soak parts the manual says to keep dry.
• Reassemble only after rinsing.

Set up a low-maintenance routine

A little routine care makes descaling less annoying. Use water that fits the machine's guidance, empty the drip tray regularly, and write down the last maintenance date.

If you want a machine with a simpler maintenance routine, our Espresso Machines: The Complete Buying Guide can help you compare options.

• Keep the manual nearby.
• Use one approved cleaner instead of improvising.
• Follow the rinse steps every time.
• Replace filters on schedule.

FAQ

The bottom line

If you remember only one thing, make it this: use the cleaner your manual approves, remove any water filter first if required, run the full cycle, and rinse thoroughly.

If you want less maintenance guesswork going forward, compare machines with clear care instructions in our Espresso Machines: The Complete Buying Guide.