How to Descale a Coffee Machine

Scale forms when hot water deposits calcium on heating elements, pipes and valves. It builds silently with every brew.

• Cooler coffee: scaled machines can brew 5-15°C below spec, which gives flat, sour cups.
• Slower flow: narrowed pipes mean slower brewing and less coffee per cycle.
• Shorter life: an overheating element is a common, preventable cause of machine failure.

Not sure? A water test strip costs under $10. Pod and espresso machines are more sensitive, so tighten the schedule one step.

Other signs: gurgling noises, less coffee per cycle, or white deposits in the reservoir. Cooler, flatter coffee is the most overlooked one.

1. 1

   Empty. The carafe, filter and grounds.

2. 2

   Mix the solution. One Dezcal packet or 1 tbsp citric acid in 32 oz warm water. Vinegar, emergencies only: equal parts with water.

3. 3

   Fill the reservoir. And start a brew with the carafe in place.

4. 4

   Pause halfway. And soak 15-30 minutes (longer for heavy scale).15-30 minutes

5. 5

   Finish the cycle. Cloudy liquid is dissolved scale.

6. 6

   Rinse twice. Run a full cycle of fresh water, discard, repeat.

7. 7

   Wash. The carafe, basket and warming plate.

Check your manual for the exact button sequence. Original Line and Vertuo Line differ (see Nespresso Vertuo vs Original).

1. 1

   Empty. The capsule container and drip tray, and place a 1-liter container under the outlet.

2. 2

   Mix. One Nespresso descaling sachet into 0.5 liters of fresh water in the reservoir.

3. 3

   Enter descaling mode. Original Line: hold Lungo and Espresso together for 3 seconds. Vertuo: hold the button for 7 seconds until it blinks orange, then rotate the lever 3 times and press.3 seconds

4. 4

   Run the cycle. (about 20 minutes) without interrupting it.20 minutes

5. 5

   Rinse. With a full reservoir of fresh water when prompted.

6. 6

   Exit. The mode as your manual says, then rinse the tank and tray.

1. 1

   Power off,. Empty the reservoir and remove any K-Cup and the filter.

2. 2

   Add. The Keurig solution bottle (or 1 tsp citric acid in 10 oz water), then fill with fresh water.

3. 3

   Brew with no K-Cup. Into a large mug on the largest size. Discard and repeat until the Add Water light comes on.

4. 4

   Optional. Soak 30 minutes if it has been over 6 months.30 minutes

5. 5

   Rinse. With fresh water until empty, twice (three times after vinegar).

6. 6

   Reinstall. The filter, brew a test cup and rinse again if you taste descaler.

1. 1

   Let it cool fully,. Then empty the tank and drip tray and remove the portafilter.

2. 2

   Add. The solution (Dezcal: one packet in 32 oz warm water) and place a 1-liter container under the group head and wand.

3. 3

   Run the cycle. Use the automatic descale mode if your machine has one; otherwise run water through until half is gone and soak 15-20 minutes.15-20 minutes

4. 4

   Flush the steam wand. With the remaining solution, since it scales too.

5. 5

   Rinse twice. Through both group head and wand. Leftover acid ruins flavor.

6. 6

   Wipe. The gasket and shower screen, then pull a test shot.

Old coffee oil turns rancid whatever the pipes look like. Follow the espresso machine cleaning routine, or see the maintenance guide for one calendar covering everything.

Heating water drives dissolved calcium and magnesium bicarbonate out of solution as solid calcium carbonate. The solid coats heating elements, boilers and narrow tubes. A scaled element heats less efficiently, so brew temperature drifts and the machine works harder.

Scale also restricts flow, which shows up as slow brewing, weak coffee, loud pumps or error lights. Water hardness (measured in grains per gallon, ppm or dH) decides how fast this happens, so a hard-water home needs descaling far more often than a soft-water one.

• Test your water hardness: cheap test strips tell you whether you need monthly or quarterly descaling.
• Use the machine's descale programme where it has one: it runs the correct volume and rinse cycle automatically.
• Prefer citric or lactic acid descalers: they dissolve scale effectively, while vinegar leaves a strong smell and can harm seals on some machines.
• Use a filter cartridge or softer water: fewer minerals in means less scale out. Avoid distilled water in machines that need minerals to detect water level.
• Rinse thoroughly: run several full tanks of fresh water afterward until no taste or smell remains.
• Descale before warning lights: schedule it by water hardness and usage, not only by the indicator.

Descaling does not clean oils; follow it with the routine in how to clean an espresso machine.

Buying tablets for routine cleaning? See best coffee machine cleaning tablets.