Domakihub How to Descale a Coffee Machine and Keep It Brewing Like New
Remove limescale buildup in under an hour and restore full flavour to every cup.
Reviewed by Domakihub cleaning pros · 2026-06-23 · 5 min read
Greece has some of the hardest tap water in southern Europe, which means limescale builds up inside coffee machines faster than most people expect — sometimes within a few weeks of regular use. Whether you manage a holiday rental in Crete, run a small hotel on one of the islands, or simply want your home espresso machine to last, descaling is the single most effective maintenance task you can do. The video above walks through the full process visually; the steps below give you the practical detail to get it done confidently on any common machine type.
Why Limescale Is the Enemy of Good Coffee
Limescale — the white, chalky residue left behind when hard water evaporates — coats the internal heating element and water channels of your coffee machine. The result is a machine that heats unevenly, brews at the wrong temperature, and produces bitter or watery coffee. Left unchecked for months, scale deposits can block flow restrictors and permanently damage the boiler.
In Greece, water hardness varies by region but is notably high in Athens, Thessaloniki, and many island municipalities. If you are managing a property that sits unused for weeks at a time, stagnant hard water in the reservoir accelerates the problem considerably. Descaling every four to eight weeks is a realistic target for high-usage machines in hard-water areas.
Descaler vs. White Vinegar: Which Should You Use?
Commercial descaling solutions (sold as tablets or liquid concentrates by brands such as Durgol, Saeco, and De'Longhi) are formulated to dissolve calcium carbonate quickly without leaving an aftertaste or corroding rubber seals. They are the recommended choice for espresso machines and pod machines where the boiler and grouphead are under pressure.
White vinegar (diluted 1:1 with water) is a viable budget alternative for drip filter machines and French press-style brewers where there are no pressurised components. It takes slightly longer to rinse out completely — expect two or three water-only cycles before the smell disappears. Citric acid powder dissolved in water (roughly one tablespoon per litre) sits in between: fast-acting and rinse-clean, and easy to find in Greek pharmacies and supermarkets.
How to Descale a Coffee Machine: Step by Step
- 1
Empty and prepare the machine
Remove any coffee pods, filter baskets, or used grounds. Empty and rinse the water reservoir and carafe. Do not run the descaling cycle with coffee inside — the acidic solution will absorb flavours and the result will be undrinkable. Place a large jug or bowl under the outlet to catch the descaling liquid as it passes through.
- 2
Mix and add your descaling solution
For a commercial descaler, follow the packet ratio — typically one tablet or 30 ml of liquid concentrate dissolved in 500 ml to 1 litre of water, depending on your machine's reservoir capacity. For a vinegar solution, combine equal parts white vinegar and cold water until the reservoir is full. For citric acid, dissolve one tablespoon of powder per 500 ml of water. Pour the solution into the reservoir.
- 3
Run the descaling cycle
Most modern machines have a dedicated descale mode: consult your manual or hold the appropriate button combination (often the steam and power buttons simultaneously). If your machine has no descale mode, simply start a normal brew cycle. Halfway through — after roughly half the liquid has passed through — pause the machine and let the solution sit inside the boiler and pipes for 20 to 30 minutes. This dwell time is critical: it allows the acid to soften and loosen calcium deposits rather than just flushing past them. Then resume and let the cycle finish.
- 4
Rinse with two full cycles of clean water
Discard the descaling liquid that collected in the jug. Fill the reservoir to capacity with fresh, cold water and run a complete brew cycle. Discard that water too. Refill and run a second full rinse cycle. Two cycles are the minimum; if you used vinegar and can still detect the smell, run a third. This step is non-negotiable for pod and espresso machines — residual descaler will affect the taste of the next coffee and can irritate the throat.
- 5
Clean the removable parts and reassemble
While the machine is still warm from the rinse cycles, wash the water reservoir, drip tray, carafe, and filter basket with warm soapy water, rinse them thoroughly, and dry before reassembling. Wipe the steam wand (if present) with a damp cloth. Once everything is back in place, brew a short test shot or a small amount of hot water and taste it — it should be clean and neutral, with no chemical or acidic aftertaste. Your machine is ready to use.
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FAQ
- How often should I descale my coffee machine in Greece?
- Every four to eight weeks for machines used daily in hard-water areas such as Athens or most Greek islands. If your machine has a hardness indicator or descale warning light, trust it. For machines in holiday rentals used seasonally, descale at the start of each rental season and once mid-season if occupancy is high.
- Can I use lemon juice instead of vinegar or a commercial descaler?
- Yes, but with caveats. Fresh lemon juice contains citric acid and will dissolve limescale, but the pulp can block narrow water channels in espresso machines. Bottled lemon juice is safer but still weaker than a commercial solution. Citric acid powder dissolved in water gives you the same active ingredient in a controlled, pulp-free form and is the better DIY alternative if you want to avoid buying a branded descaler.
- My coffee machine has a descale light that will not turn off after I have already descaled it — what should I do?
- Most machines require you to complete a specific reset sequence after descaling — simply running the cycle is not always enough to clear the indicator. Check your manual for the reset steps, which usually involve holding a button for three to five seconds once the rinse cycle finishes. If the light persists after a correct reset, the machine's flow sensor may be detecting residual scale; a second full descaling run followed by two rinse cycles typically resolves it.