What Descaling Does and Why Your Keurig Needs It
Descaling removes mineral buildup from the inside of your Keurig — calcium and magnesium deposits that accumulate when water heats repeatedly. Over time, this buildup slows water flow, makes your coffee taste off, and can damage the heating element. Most Keurig machines will display a "descale" light or message when minerals have accumulated enough to affect performance.
You should descale every three to six months, depending on your water hardness. If you have hard water (high mineral content), descale every three months. Soft water users can go six months. If you notice your Keurig brewing slower than usual or the descale light appears, that is your signal to descale regardless of the calendar.
Key Takeaways
- Descaling uses a commercial descaling solution (not vinegar) to dissolve mineral deposits inside your Keurig's water lines and heating chamber.
- The process takes about 30 minutes total and involves running the solution through the machine, then flushing it out with fresh water.
- You will need a descaling solution made for Keurig machines, a large mug or container, and access to your machine's water reservoir.
- After descaling, run at least four full reservoirs of fresh water through the machine to remove all solution residue before brewing coffee again.
Gather Your Materials Before You Start
You will need a Keurig descaling solution — the brand makes its own, sold as "Keurig Descaling Solution" in a 14-ounce bottle. Other brands like Dripkit and Dezcal also make solutions designed for Keurig machines. Do not use vinegar, despite what you may read online; vinegar is too weak to dissolve mineral buildup effectively and can leave an odor in your machine.
Have a large mug or container ready — something that holds at least 12 ounces. You will also need access to your sink and fresh water. Remove any K-Cup from the machine and empty the water reservoir completely before you begin.
Run the Descaling Solution Through the Machine
Fill the water reservoir with the descaling solution according to the bottle's instructions — usually one bottle mixed with water to fill the reservoir. Place your large mug or container on the drip tray beneath the brew head.
Turn on the machine and run it through a brew cycle without inserting a K-Cup. The solution will flow into your mug. Let it sit in the mug for 30 seconds, then discard it. Repeat this process — brew, wait 30 seconds, discard — until the reservoir is empty. This usually takes 5 to 7 brew cycles.
Once the reservoir is empty, let the machine sit for 15 minutes. This allows the solution to work on stubborn mineral deposits inside the heating chamber and water lines.
Flush Out the Descaling Solution with Fresh Water
After the 15-minute wait, refill the reservoir with fresh water only — no more solution. Run the machine through brew cycles again, discarding the water each time, until the reservoir is completely empty. This first flush removes most of the descaling solution.
Refill the reservoir a second time with fresh water and repeat the process. After the second flush, your machine should no longer smell like descaling solution. If it does, run a third flush with fresh water.
Test Your Machine and Clear the Descale Light
Once you have completed the flushes, insert a K-Cup and brew a full cup of coffee. Taste it — it should taste normal, not chemical or soapy. If it tastes off, run one more cycle of fresh water through the machine.
Most Keurig machines will automatically clear the descale light once you have run enough water through them. If your light is still on after you have completed all the steps, check your machine's manual for how to manually reset it. Some models require you to hold a button combination for a few seconds; others reset automatically after 24 hours of normal use.
Common Mistakes to Avoid
The most common error is not flushing thoroughly enough. Leftover descaling solution will make your coffee taste bitter or chemical. If you are unsure whether you have flushed enough, run one more cycle of fresh water — it does not hurt the machine.
Another mistake is using vinegar instead of a proper descaling solution. Vinegar is acidic but not strong enough to break down mineral deposits effectively, and the smell lingers in the machine for weeks. Stick with a solution made for Keurig machines.
Do not skip the 15-minute soak after running the solution through. That wait time allows the solution to penetrate mineral buildup that is stuck to the heating element and internal water lines. Rushing through this step means the descaling will not work as well.
Frequently Asked Questions
Can I use white vinegar to descale my Keurig?
No. While vinegar is acidic, it is not strong enough to dissolve mineral deposits in a Keurig, and the smell will linger in your machine for weeks. Use a descaling solution made for Keurig machines instead — it is inexpensive and works much faster.
How long does the whole descaling process take?
About 30 minutes from start to finish. The actual brew cycles take 10 to 15 minutes, the 15-minute soak takes 15 minutes, and flushing with fresh water takes another 10 minutes. You can do other things while the machine is running.
What if my Keurig still brews slowly after descaling?
Run the descaling process again — you may not have flushed thoroughly enough, or mineral buildup was heavier than usual. If it is still slow after a second descaling, the heating element may be damaged and you may need to contact Keurig support or consider replacing the machine.
Do I need to descale if I use filtered water?
Filtered water reduces mineral buildup but does not eliminate it completely. You should still descale every six months or when the descale light appears. Filtered water just extends the time between descalings compared to tap water.
Can I drink the water that comes out during descaling?
No. Discard all water and solution that runs through the machine during descaling and flushing. The descaling solution is not safe to drink, and the water that comes out contains dissolved minerals and solution residue.