Descaling removes mineral buildup that blocks water flow and ruins espresso quality

Descaling is the process of running a mild acid solution through your Café espresso machine to dissolve calcium and mineral deposits left behind by water. Over time, these deposits accumulate inside the boiler, group head, and internal tubes, slowing water flow and making it harder to pull shots. A machine that takes longer to brew or produces weak espresso even with fresh beans usually needs descaling.

How often you descale depends on your water hardness. If you have soft water or use a filter pitcher, descaling every three to six months is usually enough. Hard tap water may require descaling every month. Café machines come with a water hardness test strip in the box — use it to check your water, and that will tell you the right interval.

The process takes about 30 minutes and requires only a descaling solution, a container to catch liquid, and access to your machine's water tank and drain valve.

Key Takeaways

  • Descaling removes mineral buildup inside the boiler and group head that slows water flow and weakens espresso.
  • Use only a descaling solution designed for espresso machines — never vinegar or other household cleaners, which can damage seals and leave residue.
  • The process involves filling the water tank with diluted descaling solution, running it through the group head and steam wand, then flushing with fresh water until the tank is empty.
  • How often you descale depends on water hardness; test strips included with your machine help you determine the right interval.
  • Descaling is different from backflushing (which cleans the group head basket) and should be done separately on its own schedule.

What descaling solution to buy for a Café machine

Café does not make its own descaling solution, so you will need to buy one separately. The most common choice is Cafiza or Durgol, both designed specifically for espresso machines and widely available online and at kitchen supply stores. These solutions are mild acids that dissolve mineral deposits without harming the rubber seals, gaskets, or internal components of your machine.

Do not use white vinegar or other household cleaners. Vinegar is too strong and can damage seals over time. It also leaves a smell and taste that is hard to rinse out completely. Stick to a solution made for espresso machines — the cost is low (usually $8 to $15 per bottle) and one bottle lasts through many descaling cycles.

Follow the dilution ratio on the bottle. Most solutions require mixing with water at a 1:1 ratio, but some are stronger or weaker, so read the label before you start.

Step-by-step descaling process

Step 1: Empty and prepare. Turn off the machine and let it cool for 10 minutes. Remove the water tank and empty it completely. Fill it with the diluted descaling solution according to the bottle instructions.

Step 2: Run solution through the group head. Place a container under the group head to catch liquid. Insert the portafilter (without the basket) into the group head. Turn the machine on and let water flow for about 10 seconds, then turn it off. Repeat this cycle — 10 seconds on, 10 seconds off — for about 5 minutes. This allows the solution to soak and work on deposits inside the group head.

Step 3: Flush the steam wand. Place the container under the steam wand. Open the steam valve and let solution flow for about 10 seconds. Close it and wait 10 seconds. Repeat for about 2 minutes. This clears mineral buildup in the wand that can block steam or water flow.

Step 4: Soak the boiler. Once you have cycled solution through the group head and steam wand, turn off the machine and let it sit for 15 to 20 minutes. This gives the acid time to dissolve deposits inside the boiler where water sits.

Step 5: Flush with fresh water. Empty the water tank and refill it with fresh, cold water. Run water through the group head and steam wand using the same 10-seconds-on, 10-seconds-off cycle until the tank is empty. This removes all traces of descaling solution. Repeat this flush cycle two more times with a full tank each time to make sure no solution remains.

Step 6: Test and brew. Fill the tank with fresh water one final time. Run water through the group head and into a cup — it should flow smoothly and taste like plain water with no chemical smell. If you detect any descaling solution smell or taste, run another full tank through the machine.

Signs your Café machine needs descaling now

Even if you follow a regular descaling schedule, watch for these signs that your machine needs it sooner. Water flow slows down noticeably — shots that normally take 25 seconds now take 40 seconds or longer. The espresso tastes weak or sour even though your beans are fresh and your tamping is consistent. The steam wand produces weak steam or sputters instead of flowing smoothly.

Any of these symptoms means minerals have built up enough to restrict water and steam flow. Descaling will restore normal performance. If you descale and the problem persists, the issue may be a clogged shower screen or a problem with the pump, not mineral buildup.

Descaling versus backflushing and other cleaning

Descaling is not the same as backflushing, and you should do both on different schedules. Backflushing uses water pressure to force water backward through the group head basket to clear out old coffee grounds and oils. You backflush during regular use — usually once or twice a week — by inserting a blank basket (no holes) into the portafilter and running water for a second, then stopping, then running again. This keeps the group head clean between shots.

Descaling, by contrast, runs a chemical solution through the entire machine to dissolve mineral deposits. You do this once a month to once every three months depending on water hardness. Both are necessary: backflushing keeps the group head free of coffee residue, and descaling keeps minerals from clogging the boiler and internal tubes.

You should also soak the portafilter, basket, and shower screen in hot water with a cleaning powder like Cafiza once a week to remove coffee oils and residue. This is separate from both backflushing and descaling.

Troubleshooting descaling problems

If water will not flow through the group head during descaling, the machine may already be too clogged. Try running the descaling solution through the steam wand first to soften deposits, then wait 20 minutes and try the group head again. If water still will not flow, you may need to repeat the soak cycle or use a stronger descaling solution — some machines with very heavy buildup need a second descaling cycle a few days later.

If you smell or taste descaling solution after flushing, you did not rinse enough. Run at least two more full tanks of fresh water through the machine, cycling 10 seconds on and 10 seconds off each time. The solution is harmless in small amounts but tastes bad and can affect espresso flavor.

If descaling does not improve water flow or steam pressure, the problem may not be mineral buildup. Check that the shower screen is not clogged with coffee grounds, and make sure the water tank is full and seated properly. If flow is still slow after descaling and those checks, contact Café support — the pump or internal valves may need service.

Frequently Asked Questions

Can I use vinegar to descale my Café espresso machine?

No. Vinegar is too acidic and can damage rubber seals and gaskets inside the machine. It also leaves a strong smell and taste that is difficult to rinse out completely. Use a descaling solution made for espresso machines instead — they are mild enough to be safe and cost only a few dollars per use.

How long does descaling take?

The active process takes about 30 minutes from start to finish, including the soak time. Most of that is waiting — the actual hands-on work of running solution and water through the machine is only about 10 minutes. Plan for the machine to be out of use for about an hour if you include cooldown and the final test brew.

What if my machine has a built-in descaling cycle?

Some newer Café models have an automatic descaling mode that you set up from the control panel. If yours has one, follow the manual instructions for that mode — it will prompt you to add solution to the tank and run the cycle automatically. You still need to flush with fresh water afterward to remove all traces of solution.

Do I need to descale if I use filtered water?

Filtered water reduces mineral buildup, so you can descale less often — every four to six months instead of monthly. However, even filtered water contains some minerals, so descaling is still necessary. Use the water hardness test strip that came with your machine to check your filtered water and determine the right interval.

Can I descale while the machine is hot?

No. Always let the machine cool for at least 10 minutes before starting. Hot metal and hot descaling solution can cause burns, and the heat can affect how the solution works. A cool machine is safer and descales more effectively.