How to Descale Your Espresso Machine

Scale is the silent killer of espresso machines. Calcium and magnesium deposits from your water accumulate inside the boiler, heating elements, and internal tubing over time. Left unchecked, scale restricts water flow, reduces heating efficiency, and eventually causes expensive component failures. The good news is that descaling is straightforward and takes about 30 minutes.

How Often Should You Descale?

Frequency depends almost entirely on your water hardness. If you don't know your water's hardness, pick up a test strip kit from a hardware store—they cost a few dollars and take 30 seconds.

Soft water (0–60 ppm): Every 6–12 months.
Moderate water (60–120 ppm): Every 3–4 months.
Hard water (120–180 ppm): Every 1–2 months.
Very hard water (180+ ppm): Monthly, or switch to filtered/bottled water.

Some machines like the Breville Barista Touch have built-in descale alerts based on usage. These are helpful reminders but shouldn't be your only indicator—they don't measure actual scale buildup.

What You Need

A commercial descaling solution. Use a citric acid-based descaler designed for espresso machines. Avoid white vinegar—it leaves a lingering smell and taste that's extremely difficult to flush out completely.
Fresh water for rinsing (at least two full reservoir tanks).
A container to catch the solution as it runs through.
About 30 minutes of uninterrupted time.

We recommend Urnex Dezcal, which is widely used in commercial coffee shops and safe for all machine types. Check price on Amazon

Universal Descaling Steps

These steps work for most semi-automatic and super-automatic machines. Always check your machine's manual for model-specific instructions, but the core process is the same.

Prepare the solution. Empty the water reservoir. Mix the descaling solution with fresh water according to the product's instructions (typically one packet or one ounce per liter of water). Fill the reservoir with the mixture.
Run through the group head. Place a container under the group head. Start the brew cycle and let about a cup of solution flow through, then stop. Wait 5 minutes to let the solution work on internal scale deposits. Repeat this start-stop cycle until you've used about half the reservoir.
Run through the steam wand. Open the steam valve and let the remaining solution flow through the steam wand into your container. This clears the boiler and steam circuit, which are common places for heavy buildup.
Rinse thoroughly. Fill the reservoir with clean, fresh water. Run the entire tank through the group head and steam wand. Then fill and run a second full tank of clean water through both circuits. Two full rinse cycles are essential—residual descaling solution will ruin the taste of your next several shots.

How to Descale a Breville Espresso Machine

Breville machines (Bambino Plus, Barista Express, Barista Touch) have a specific descale mode. On most models:

Empty and remove the water filter from the reservoir.
Mix one Breville descaling tablet (or a third-party citric acid descaler) with the full reservoir of water.
Press and hold the designated descale button combination (varies by model—check your manual).
The machine will automatically cycle the solution through the group head and hot water outlet.
When the cycle completes, refill with clean water and run the descale cycle again to rinse.

For detailed Breville model comparisons and features, see our Breville lineup guide.

How to Descale a Gaggia Classic Pro

The Gaggia Classic Pro doesn't have an automatic descale mode, so you'll follow the universal steps above with one important addition:

Remove the shower screen and clean it separately (it collects coffee oils and some mineral deposits).
Fill the reservoir with descaling solution.
Run solution through the brew group in short bursts, pausing between each to let the solution soak.
Run the remaining solution through the steam wand.
Rinse with two full tanks of clean water through both circuits.
Reinstall the shower screen and pull a test shot (discard it) before making drinks.

How to Descale a DeLonghi

DeLonghi super-automatic machines (like the Magnifica Start) typically have a guided descale mode accessible through the control panel:

Fill the reservoir with the DeLonghi descaling solution (or a compatible citric acid descaler) mixed with water.
Enter the descale mode through the machine's menu or by pressing and holding the designated button.
Follow the on-screen prompts—the machine will automatically cycle solution through the brew unit and steam circuit.
When prompted, refill with clean water and run the rinse cycle.
The machine will indicate when the process is complete.

DeLonghi recommends using their branded descaling solution, but any food-safe citric acid descaler works. Just avoid vinegar.

Descaling vs. Backflushing

These are two different maintenance tasks that address different problems, and it's important not to confuse them:

Descaling removes mineral deposits (calcium and magnesium scale) from the boiler, heating elements, and internal water lines. It's a chemical process using an acidic solution.
Backflushing removes coffee oil residue from the group head, shower screen, and three-way solenoid valve. It uses a blind basket and espresso detergent like Cafiza.

You need both. Backflushing should happen weekly (for machines with a three-way valve), while descaling happens every few months. For a complete maintenance schedule, see our maintenance guide.

Preventing Scale Buildup

The best descaling strategy is needing to descale less often. Here's how:

Use filtered water. A simple carbon filter (like a Brita pitcher) reduces chlorine and some minerals. For espresso specifically, the ideal mineral content is 50–150 ppm total dissolved solids (TDS). Water that's too soft actually makes flat-tasting espresso, so don't use distilled or reverse-osmosis water unless you add minerals back in.
Use your machine's built-in filter. Many Breville and DeLonghi machines come with replaceable water filters in the reservoir. Use them and replace them on schedule (usually every 2–3 months).
Empty the reservoir overnight. Don't leave water sitting in the machine for days. Stagnant water accelerates mineral deposition and can develop bacteria.
Consider a water recipe. Serious home baristas mix distilled water with mineral concentrates (like Third Wave Water) to create water with the perfect mineral balance for espresso flavor and machine health.

Signs Your Machine Needs Descaling

Don't wait for these symptoms to appear before descaling—follow a regular schedule based on your water hardness. But if you notice any of the following, descale immediately:

Slower flow rate. Shots take noticeably longer than usual even at the same grind setting. Scale is restricting water flow through the internal lines.
Reduced steam pressure. The steam wand produces weaker steam than it used to, taking longer to froth milk. Scale buildup in the boiler reduces its effective volume and heating capacity.
Strange noises. Louder-than-usual pump sounds or gurgling can indicate that the pump is working harder to push water through scaled-up lines.
Temperature fluctuations. If your machine struggles to maintain consistent brewing temperature, scale on the heating element may be insulating it from the water.
White flakes in your cup. Visible mineral deposits in your espresso mean scale is actively breaking off inside the machine. Descale urgently.
The descale indicator light. If your machine has one and it's on, don't ignore it.

Regular descaling is one of the simplest ways to extend the life of your machine by years. Combined with proper backflushing and daily cleaning, even a budget machine can last a decade or more. If you're just getting started with home espresso, our beginner's guide covers the full equipment and technique essentials. And for help choosing the right machine, browse our espresso machine reviews.