If your espresso is tasting flat, your machine is taking longer to heat up, or steam pressure has dropped, it’s time to descale. Descaling an espresso machine removes the calcium and magnesium mineral deposits (known as limescale or scale) that accumulate inside boilers, thermoblocks, and water lines over time. This step-by-step guide walks you through the entire process safely and effectively.
What Is Descaling and Why Does It Matter?
Every time water is heated in your espresso machine, dissolved minerals are left behind as scale. Over months of use, this scale forms a hardened crust that:
- Insulates the heating element, forcing it to use more energy and increasing heat-up time
- Narrows water lines, reducing flow and pressure
- Affects water temperature consistency, ruining shot quality
- Can permanently damage boilers if left untreated
Descaling dissolves this mineral buildup using a mildly acidic solution that passes through the machine’s water circuit, restoring performance without damaging internal components.
How Often Should You Descale?
The frequency depends on two factors: water hardness and usage volume.
- Soft water, light use: Every 3 months
- Medium hardness, regular use: Every 6–8 weeks
- Hard water or heavy use: Monthly
Many modern machines include a descale indicator light. Even if yours doesn’t, follow the schedule above as part of your regular espresso machine maintenance routine.
What You’ll Need
- A food-safe espresso machine descaling solution (Urnex Dezcal, Cafetto Descaler, or brand-specific descaler)
- Fresh water
- A large container or jug to catch waste water
- Microfiber cloth
Important: Never use white vinegar to descale an espresso machine. It can damage rubber seals and leave a lingering acidic taste. Always use a purpose-made descaling solution. See our guide to the best espresso machine cleaning products for our top recommendations.
Step-by-Step: How to Descale an Espresso Machine
While exact steps vary by brand and model, the general process is consistent across most machines. Always consult your machine’s manual for model-specific instructions.
Step 1: Prepare the Descaling Solution
Mix your descaling solution with water according to the product’s instructions. Most solutions require dissolving one sachet or tablet in 0.5–1 litre of water. Fill your machine’s water reservoir with this solution.
Step 2: Remove and Store the Portafilter
Remove the portafilter from the group head. You don’t want the descaling solution passing through the group head circuit in most machines — the solution is typically routed through the boiler and steam circuit instead. Check your manual for your machine’s specific descaling flow path.
Step 3: Enter Descaling Mode (If Applicable)
Many machines — especially automatic and super-automatic models — have a dedicated descaling mode accessible through the control panel. This mode runs the solution through the machine at the correct flow rate and pauses at intervals to allow the solution to soak. Activate this mode if your machine has it.
For machines without a descaling mode, you’ll run the solution manually through the brew and steam circuits in short cycles.
Step 4: Run the Descaling Solution Through the Brew Circuit
Place a large container under the group head and steam wand. Start the machine and allow the descaling solution to flow slowly through the brew circuit in short 10–15 second bursts, pausing for 30 seconds between each burst. This allows the acid to contact and dissolve scale deposits before being flushed out.
Step 5: Run Solution Through the Steam Circuit
Once the boiler is at steam temperature, open the steam wand valve and allow the descaling solution to pass through the steam circuit into your container. Run until the reservoir is nearly empty.
Step 6: Rinse with Fresh Water
Empty and rinse the water reservoir thoroughly. Refill it with fresh, clean water. Run at least two full reservoirs of fresh water through both the brew circuit and steam wand to completely flush out any remaining descaling solution. This step is critical — residual descaler affects the taste of your espresso.
Step 7: Run a Test Shot
Pull a test shot of espresso (discard it) to confirm the machine is clean and the flavor is neutral. Your first few shots may taste slightly off — run 2–3 purge shots before pulling a shot to drink.
How to Descale Specific Machine Types
Breville / Sage Machines
Breville machines typically have a dedicated DESCALE button sequence. Hold the 1-cup and 2-cup buttons simultaneously for 3 seconds to enter descaling mode on most models. The machine guides you through the process automatically.
DeLonghi Machines
DeLonghi recommends using their EcoDecalk solution. Enter descaling mode by pressing the descale button (often marked with a water drop and wrench icon) and follow the guided process on the display.
Nespresso Machines
Nespresso has a built-in descaling mode. Press and hold specific button combinations (varies by model) to activate, then use the Nespresso descaling kit or a compatible solution. Nespresso’s official app also provides model-specific descaling instructions.
E61 Group Head Machines (Rocket, ECM, Lelit)
Prosumer E61 machines require a more involved descaling process due to the thermosyphon circuit. Many owners use a dedicated descaling solution run through the machine manually, or opt for a citric acid-based solution. Consult your specific machine’s manual or community forums for precise guidance.
Tips for Reducing Scale Buildup
- Use filtered water: A good water filter reduces mineral content significantly, slowing scale accumulation.
- Use the right water hardness: Espresso machines perform best with water in the 50–175 ppm hardness range. Very soft water (below 50 ppm) can be corrosive; very hard water (above 200 ppm) scales rapidly.
- Replace your water filter: If your machine has a built-in water filter (like Breville’s water filter), replace it every 2–3 months.
How Descaling Fits Into Your Full Maintenance Routine
Descaling is one pillar of a complete espresso machine care routine. Pair it with regular backflushing to clean the group head, steam wand maintenance, and a structured maintenance schedule for optimal results. Explore our full espresso machine maintenance guide for the complete picture, and check our maintenance schedule checklist to keep every task on track.
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