How to Descale an Espresso Machine (Step by Step)
If your espresso is starting to taste flat, your machine is slower to heat, or you can hear more gurgling than usual, limescale is the likely culprit. Descaling is one of the simplest bits of maintenance you can do at home, and it makes a real difference to both flavour and the life of your machine. Here is how to do it properly.
What is descaling, and why does it matter?
Every time your machine heats water, tiny amounts of minerals (mostly calcium and magnesium) are left behind. Over weeks and months these build up as limescale inside the boiler and pipes. Left alone, scale restricts water flow, throws off your brew temperature and forces the machine to work harder than it should.
Descaling uses a mild acidic solution to dissolve that mineral build-up and flush it out. It is different from cleaning the group head with a coffee residue cleaner: descaling tackles mineral scale on the inside, while backflushing and cleaning tackle coffee oils. Most home machines benefit from both on a regular schedule.
How often should you descale?
It depends on how hard your local water is and how much coffee you pull. As a general guide:
- Hard water areas: every 1 to 2 months
- Soft water areas: every 3 months or so
- Heavy daily use: lean towards the more frequent end
Using filtered water will slow scale build-up, but it will not stop it entirely, so keep descaling part of your routine. If your machine has a descale warning light, follow that as your prompt.
What you will need
- A purpose-made descaler suited to espresso machines
- Fresh water to rinse thoroughly
- A large jug or bowl to catch the run-off
- Your machine manual for any model-specific steps
We recommend a dedicated product like the Cafetto Renew Descaler rather than household vinegar. Purpose-made descalers are formulated to clear scale without leaving a lingering taste or risking damage to seals and internal parts.
Step by step: how to descale your espresso machine
1. Read your manual first
Every machine is a little different. Some have a built-in descale cycle; others need you to run the solution through manually. Check whether your model has any parts that should be removed first, and always switch off and unplug before you begin handling water tanks.
2. Mix the descaling solution
Empty the water tank, then mix your descaler with fresh water following the dosage on the pack. Getting the ratio right matters, so measure rather than eyeball it. Pour the solution into the tank.
3. Run the solution through
Place your jug under the group head and steam wand. Turn the machine on and let it run water through the group head in stages, pausing to let the solution work. Run a little through the steam wand too, as scale collects there as well. Follow the timing your descaler recommends.
4. Rinse thoroughly
This step is the one people rush, and it is the most important. Remove the tank, rinse it well, refill with clean fresh water, and run at least two full tanks through the group head and steam wand. You want no trace of descaler left before you make your next coffee.
5. Pull a throwaway shot
Once rinsed, pull one espresso shot and tip it out. This clears the lines and lets you taste-check that everything is clean before you brew a cup you actually want to drink.
Keep coffee residue in check too
Descaling handles the water side, but coffee oils build up on the group head and portafilter over time and can turn bitter. A regular clean with a product such as the Cafetto EVO Organic Machine Cleaner keeps that side fresh. You will find both descalers and cleaning gear in our accessories collection.
A few tips to scale less often
- Use filtered or bottled water where you can
- Empty the water tank if the machine will sit unused for a while
- Wipe the steam wand and group head after each session
- Pair fresh beans with a clean machine for the best cup, and store them well in an airtight canister
Stay on top of descaling and cleaning and your machine will reward you with better crema, steadier temperature and years of reliable service. Pair it with freshly roasted beans and you are set for cafe-quality coffee at home.