Descaling removes mineral buildup that slows water flow and affects taste

Descaling is running a cleaning solution through your Keurig to dissolve calcium and mineral deposits that accumulate inside the machine. These deposits come from tap water and build up in the heating chamber and tubes over time. When mineral buildup gets heavy, your Keurig brews slower, the water may not heat properly, and your coffee tastes flat or bitter.

You descale by filling the water reservoir with a descaling solution (usually citric acid or white vinegar), running it through the machine without a K-Cup, then flushing the system with fresh water. The whole process takes about 30 minutes and costs a few dollars. Most Keurig models have a descale mode button that walks you through it, though the steps are nearly identical across all machines.

Key Takeaways

  • Descale your Keurig every three to six months, or sooner if you have hard tap water or notice slower brewing.
  • You need a descaling solution (Keurig brand, white vinegar, or citric acid), an empty mug, and about 30 minutes.
  • The process involves filling the reservoir, running the solution through, then flushing with fresh water multiple times until the reservoir is empty.
  • If your Keurig has a Descale button, press it to enter descale mode; if not, you can run the solution manually without the button.

What you need before you start

Descaling solution is the main thing. Keurig sells its own brand (usually around $5 to $7 per bottle), which works well and is formulated specifically for their machines. White vinegar (the kind you cook with) works just as well and costs less—use a 1:1 ratio of vinegar to water. Citric acid powder mixed with water also works; follow the packet instructions for the ratio. Do not use bleach or other household cleaners.

You will also need an empty mug or small bowl to catch the liquid as it runs through, and access to fresh tap water for rinsing. Set aside about 30 minutes with no interruptions. Make sure your Keurig is plugged in and the water reservoir is empty before you begin.

Step 1: Fill the reservoir and enter descale mode

Remove the water reservoir from the top of your Keurig and empty it completely. Fill it with your descaling solution—if using Keurig brand solution, follow the bottle label for how much to use (usually the whole bottle mixed with water to fill the reservoir). If using vinegar, mix equal parts white vinegar and water until the reservoir is full. If using citric acid, mix according to the packet and fill the reservoir.

Place the reservoir back on the machine. If your Keurig has a Descale button (usually on the side or front), press and hold it for three seconds until the light starts blinking. This puts the machine into descale mode. If your model does not have a Descale button, you can still descale—just skip this step and proceed to brewing. Place an empty mug on the drip tray under the brew head.

Step 2: Run the solution through without a K-Cup

Make sure no K-Cup is in the brew basket. Press the brew button (usually the middle button or the size button) and let the machine run the descaling solution into the mug. The flow will be slower than normal brewing—this is correct. Let it run until the reservoir is empty. This may take 5 to 10 minutes depending on your model.

Empty the mug when it fills. You may need to empty it two or three times as the solution runs through. Do not drink this liquid. The solution is now inside the heating chamber and tubes, breaking down mineral deposits.

Step 3: Let the solution sit for 15 minutes

Once the reservoir is empty and all the solution has run through, turn off your Keurig or let it sit idle for 15 minutes. This gives the descaling solution time to work on stubborn mineral buildup inside the machine. You do not need to do anything during this time—just wait.

If your Keurig is in descale mode, the light will continue to blink during this wait. This is normal.

Step 4: Rinse with fresh water (first flush)

After 15 minutes, empty the water reservoir completely and refill it with fresh tap water only—no more solution. Place your empty mug back on the drip tray. Press the brew button again and let the fresh water run through the machine until the reservoir is empty, just as you did with the solution. This rinses out the descaling liquid and any loosened mineral particles.

The water may look slightly cloudy or discolored as it runs through—this is normal and means the descaling solution is working. Empty the mug as needed.

Step 5: Repeat the rinse cycle one more time

Refill the reservoir with fresh tap water again. Run another full cycle of fresh water through the machine with no K-Cup in the basket. This second rinse removes any remaining solution and mineral particles. Once this cycle is complete and the reservoir is empty, your descaling is finished.

If your Keurig was in descale mode, the blinking light should stop. If it is still blinking, run one more fresh water cycle. Your machine is now ready to brew normally. Make a test cup of coffee to confirm the taste is back to normal and the brew speed has improved.

How often to descale and common mistakes to avoid

Descale every three to six months under normal use. If you have very hard tap water (lots of visible mineral deposits on faucets or in kettles), descale every two to three months. If you use filtered water or a water softener, you may only need to descale once a year.

The most common mistake is not rinsing thoroughly enough. If you skip the second fresh water rinse or do not let the reservoir empty completely, vinegar or solution taste will linger in your next cup of coffee. Another mistake is descaling too often—more than once a month can wear out internal seals over time. Do not use hot tap water to mix your solution; cold water works better and is safer. Finally, do not run a K-Cup during descaling; the solution can damage the K-Cup and waste both the solution and the pod.

Frequently Asked Questions

Can I use white vinegar instead of Keurig descaling solution?

Yes. White vinegar works just as well as Keurig brand solution and costs much less. Mix equal parts white vinegar and water, fill the reservoir, and follow the same steps. The only downside is that vinegar has a stronger smell, so you may need an extra rinse cycle to remove the vinegar taste completely. Some people prefer Keurig solution because it has less odor.

What if my Keurig still brews slowly after descaling?

Run the descaling cycle one more time. Stubborn mineral buildup sometimes needs two descaling sessions to fully clear. If it is still slow after a second descaling, the problem may be a clogged needle (the small spike that punctures K-Cups). Remove the K-Cup holder and rinse the needle under running water, or use a paperclip to gently clear any debris from the hole.

Is it safe to drink the water that comes out during descaling?

No. The solution running through contains citric acid, vinegar, or other cleaning agents. Do not drink it. Always use a mug or bowl to catch the liquid and pour it down the sink. Make sure to rinse thoroughly with fresh water afterward.

Can I descale my Keurig with lemon juice?

Yes, lemon juice works because it contains citric acid, just like commercial descaling solutions. Use fresh lemon juice or bottled lemon juice (not lemon-flavored drinks). Mix it with water at a 1:1 ratio, the same way you would with vinegar. The process and timing are identical.

Do I need to descale if I use bottled or filtered water?

You still need to descale, but less often. Filtered water has fewer minerals than tap water, so mineral buildup happens more slowly. Descale once a year instead of every three to six months. If you use a water softener, follow the same once-a-year schedule. Even with filtered water, some mineral content remains and will accumulate over time.