Brew guide · Maintenance · Updated 2026-08-17
How to Clean & Descale an Espresso Machine (UK)
The UK hard-water survival guide: why limescale kills espresso machines, how often to descale, and the exact steps for a Sage, De'Longhi or Gaggia.
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Step by step
- 1
Know your water(Every time)
UK tap water is hard in most regions (150-250 mg/L). Limescale coats the boiler and group head, raising brew temperature and clogging flow. If your area is 'very hard', descale monthly.
- 2
Backflush the group (daily-weekly)(1 min)
With a blank basket in, run the machine with a group-head cleaner tablet, then run water through with no basket. This flushes coffee oils that go rancid and bitter.
- 3
Prepare the descaler(0:05)
Use the manufacturer's descaler (Sage and De'Longhi sell branded sachets) or citric acid at 1 tbsp per litre. Never use vinegar — it attacks seals and smells.
- 4
Run the descale cycle(20 min)
Fill the tank with descaler solution, place an empty cup under both the group and steam wand, then run the machine's descale program. Repeat with clean water twice to rinse.
- 5
Keep a descale log(Ongoing)
Note the date on the box or in your phone. Hard-water UK machines that skip descaling die young — a £5 sachet every quarter protects a £500 machine.
Barista tips
- Descale more often in winter — cold mains water carries more dissolved minerals.
- A water filter (or filtered jug water) cuts descaling frequency dramatically.
- Clean the steam wand after every use: wipe, then purge for 2 seconds.
- Backflush weekly if you drink milk drinks — dairy oils are the worst residue.
Gear for this brew
The best beginner espresso machine under £500 — instant heat-up and auto-milk make great espresso genuinely easy.
The best espresso machine under £300 — slim, fast and shockingly capable once you add a decent grinder.
The legendary Classic Pro, reborn with a brass boiler — the redemption story of 2026 and still the best platform for learning espresso.
Frequently asked questions
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