A DeLonghi descale cycle works the same way on almost every model: remove the water filter, empty the drip tray, pour De’Longhi descaler into the tank and top it up with water, start the descale program, then rinse with fresh water. Run it when the descale light or display message appears, not on a guess.
The button presses and timings change by machine, so every step below comes from the official De’Longhi manual for that model. For the general theory and other brands, see our guide on how to descale an espresso machine; Breville owners can follow how to descale a Breville.
The short answer
| Model (manual) | Descale signal | How to start | Time | Container |
|---|---|---|---|---|
| Magnifica Evo (ECAM29X.6Y / 29X.8Y) | Descale indicator lights | Hold the descale button 5 s or more | About 30 min | 68 fl oz (2 L) |
| Magnifica Duo (ECAM33080) | Message on the display | Menu, Maintenance, Descaling | About 25 min | 68 fl oz (2 L) |
| Dedica (EC685 / EC695 / EC785) | Orange descale light flashes | Hold the descale button 10 s | About 25 min | 34 fl oz (1 L) |
| Dedica Duo (EC890) | Descale light comes on | Hold Steam + 2 x Espresso 10 s | About 30 min | Not stated |
| La Specialista Touch (EC9455M) | Alarm on the screen | Tap “Yes” or start from settings | About 20 min | 51 fl oz (1.5 L) |
| Stilosa (EC235 / EC260) | No light; about every 200 coffees | Selector dial, in four rounds | Not stated | 34 fl oz (1 L) |
When does a De’Longhi need descaling?
A De’Longhi needs descaling when its own descale indicator, alarm or display message appears. The manuals say the prompt follows a set period of operation that depends on the water hardness level you program, so it comes sooner in hard water.
De’Longhi’s descaling guide lists three signs that scale is already building up:
- Coffee is cooler than usual.
- Crema is thinner or less consistent.
- The flavor has changed with the same beans.
The Stilosa is the exception: it has no descale light, and its manual recommends descaling about every 200 coffees. Every other manual covered here tells you to wait for the prompt.
What to use: De’Longhi descaler, not vinegar
De’Longhi’s manuals all say to use De’Longhi descaler only, warning that an unsuitable descaler, or descaling done incorrectly, may cause faults not covered by the guarantee. Some manuals and De’Longhi’s descaling guide call the product EcoDecalk; the US store sells it as Decalk Care.
| Point | What De’Longhi says |
|---|---|
| Ingredient | Lactic acid of vegetable origin (Decalk Care product page) |
| Dose | 3.4 fl oz (100 ml) per descale; the 16.9 fl oz (500 ml) bottle holds 5 doses |
| Dilution on automatics | Descaler to level A in the tank, then water to level B |
| Dilution on Dedica and Stilosa | Descaler topped up with water to the MAX line |
| Vinegar | Not recommended: it can leave odors and may be too harsh for internal parts |
| Citric acid | Results depend on the dilution; the wrong amount can leave descaling incomplete |
| Spills | Descaler can damage delicate surfaces, so wipe them up immediately |
On the Magnifica Evo, level B means adding about 34 fl oz (1 L) of water on top of the 100 ml dose. De’Longhi also warns that hot water containing acid comes out of the spouts during the cycle, so keep your hands clear.
How to descale a DeLonghi Magnifica Evo
The Magnifica Evo runs a guided three-step program: a descale phase and two rinses, each shown by a different LED intensity. Its manual allows about 30 minutes and warns that once started, the cycle cannot be interrupted, so have a full dose of descaler ready.
- Fit the hot water spout and press the descale button for at least 5 seconds, until its LED blinks rapidly.
- Prepare the machine. Empty the drip tray and grounds container, empty the water tank and remove the softener filter if fitted.
- Fill the tank. Pour descaler to level A (one 100 ml pack), add water to level B and refit the tank.
- Place a 68 fl oz (2 L) container under the coffee spouts and the water spout, then press the descale button.
- Let it work. For about 15 minutes the machine alternates between pausing and releasing liquid from both spouts. The low-water light marks the end of this step.
- First rinse. Empty the container, rinse the tank, fill it with fresh water to MAX and press the button.
- Second rinse. Refill to MAX, refit the softener filter if you use one and press the button again.
- Finish. When the pre-ground LED lights, empty the container and the grounds container, then refill the tank.
Water in the grounds container afterwards is normal, according to the manual. If the tank was not filled to MAX, the machine asks for a third rinse.
Magnifica models with a display
On display models such as the Magnifica Duo, you start from the menu: Maintenance, then Descaling. The steps are the same in substance, with descaler to level A, water to level B and a 68 fl oz (2 L) container, but the screen walks you through two rinses. The Magnifica Duo manual gives about 25 minutes. If you postpone the job, the descale symbol stays on the home screen and the message returns each time you switch on.
How to descale a DeLonghi Dedica
The Dedica descales with its own button and the steam dial, and most of the solution comes out of the hot water and steam dispenser. These steps follow the EC685 manual, which covers the EC685, EC695 and EC785 and gives about 25 minutes.
- Remove the portafilter and place a 34 fl oz (1 L) container under the hot water dispenser and the coffee outlet.
- Fill the tank with the descaler, diluted with water up to MAX.
- Enter descale mode. Press and hold the descale button for 10 seconds, until the three buttons flash in sequence.
- Turn the steam dial to the hot water position and press the descale button to start.
- Close the steam dial from time to time, so small amounts of solution also pass through the coffee outlet.
- Rinse. When delivery stops, empty the container, rinse the tank, fill it with fresh water and press the descale button.
- Rinse again with the water filter back in place if you use one, then close the steam dial.
The orange light goes out when descaling is complete. On EX4 versions, holding the descale button for 10 seconds stops a cycle started by mistake.
Dedica Duo (EC890) differences
The Dedica Duo starts differently: with the filter removed and the tank filled, hold Steam and 2 x Espresso for 10 seconds, press the Cold brew icon, then turn the steam knob. Its manual gives about 30 minutes and ends with one rinse started from the same Cold brew icon.
How to descale La Specialista and Stilosa
La Specialista Touch runs a guided descale from its touchscreen, while the Stilosa is descaled by hand with the selector dial. Both use De’Longhi descaler.
La Specialista Touch (EC9455M): when the alarm appears, tap “Yes”, or start later from the settings menu. Pour descaler to level A and water to level B, remove the portafilter and place a container of at least 51 fl oz (1.5 L) under the brew unit, hot water spout and steam wand. The descale phase takes about 20 minutes; then you rinse the tank, fill it to MAX and run the rinse.
Stilosa (EC235 / EC260):
- Fill the tank with descaler diluted to the max level, switch on and place a 34 fl oz (1 L) container under the steam wand.
- When the READY light is on, turn the selector to the coffee and hot water position and deliver about a quarter of the solution, opening the steam dial now and then.
- Stop by closing the steam dial and turning the selector back to ON, then repeat three more times until the tank is empty.
- Rinse the tank, fill it with clean water and run it all through. Repeat the rinse once more.
How often to descale a De’Longhi
You should descale a De’Longhi whenever it prompts you, and the prompt depends on the water hardness you set. The manuals ask you to set it as soon as possible after unpacking: dip the supplied test strip in water for one second, wait about a minute and count the red squares.
| Red squares | Magnifica Evo setting | Dedica Duo setting |
|---|---|---|
| 1 | Low | Soft water |
| 2 | Medium | Medium water |
| 3 | Medium/High | Hard or very hard water |
| 4 | High | Hard or very hard water |
Getting this right matters both ways. A setting softer than your real water lets scale build up before the light comes on, while a harder setting sends you to descale more often than needed. Our guide to espresso machine water explains what the numbers mean and how water choice affects scale.
Does a water filter mean less descaling?
Yes. De’Longhi says its softener filter reduces limescale and lets you descale 20% less often. The Magnifica manuals say to replace it after two months, or after three weeks if the machine sits unused, and to take it out before every descale.
Descaling vs cleaning a De’Longhi
Descaling and cleaning are separate jobs: descaling dissolves mineral scale inside the water circuit, while cleaning removes coffee oils and milk residue. De’Longhi’s manuals list the cleaning tasks separately from the descale program.
- Brew unit (super-automatics): De’Longhi says to remove it, soak it in lukewarm water for about 5 minutes and clean it at least monthly, with water only.
- Dedica brew unit: after every 200 coffees, run about 16.9 fl oz (0.5 L) of water through it with no coffee.
- Filters and tank: clean the coffee filters once a month; wash the tank whenever you change the water filter.
- Steam wand or milk system: wipe after every use.
Our guide on how to clean an espresso machine covers these routines in detail, and the guide to super-automatic espresso machines explains how the brew unit works.
The bottom line
To descale a De’Longhi, use De’Longhi’s own descaler, take out the water filter, follow your model’s start sequence and never skip the rinses. Set the water hardness with the supplied strip so the descale light comes on at the right time. Change the softener filter on schedule and the prompts will come less often.
Sources
- De’Longhi manuals, super-automatics: Magnifica Evo ECAM29X.6Y / 29X.8Y and Magnifica Duo ECAM33080 (descale button and menu steps, level A 100 ml and level B 1 L, 2 L container, 15, 25 and 30 minutes, rinses, hardness strip levels, filter every two months or three weeks idle)
- De’Longhi manuals, manual machines: Dedica EC685, Dedica Duo EC890, La Specialista Touch EC9455M and Stilosa EC235 / EC260 (descale lights and buttons, 1 L and 1.5 L containers, 20, 25 and 30 minutes, every 200 coffees, 0.5 L brew unit rinse, hardness levels)
- De’Longhi support: How to descale a coffee machine and Magnifica Evo descaling and cleaning (signs, 30 to 50 minutes, vinegar and citric acid, cycle cannot be interrupted)
- De’Longhi US store: Decalk Care descaler (lactic acid of vegetable origin, 100 ml dose, 5 doses) and water filter DLSC002 (descale 20% less often, up to 2 months)
- De’Longhi brew unit care: Brewing unit cleaning and maintenance (soak about 5 minutes, at least monthly, water only)
