Descale every one to three months, depending on your water hardness
How often you descale depends on the mineral content in your tap water. If you have hard water — water with high levels of calcium and magnesium — descale every month. If your water is soft or medium hardness, descale every two to three months. The easiest way to know your water hardness is to check your local water utility's annual report, which is free and online, or buy a water hardness test strip from a hardware store for a few dollars.
Descaling removes mineral buildup that slows water flow, makes coffee taste flat, and eventually damages the heating element. If you ignore it, your machine will brew slower and slower until it stops working altogether. Descaling is cheap prevention — a bottle of descaling solution costs $5 to $10 and lasts for multiple uses.
Key Takeaways
- Hard water requires descaling every month; soft or medium water needs it every two to three months.
- Check your local water utility's annual report online to find out your water hardness for free.
- Descaling solution costs $5 to $10 per bottle and each bottle runs multiple descale cycles.
- Skipping descaling shortens your machine's lifespan and makes coffee taste worse over time.
- Most machines need a descale cycle that takes 15 to 30 minutes and uses only water and solution.
Signs your coffee maker needs descaling now
Do not wait for the calendar if your machine shows these signs. Slower brewing is the most obvious one — if your coffee takes noticeably longer to drip through than it used to, minerals are clogging the spray head or heating element. Weaker or flat-tasting coffee is another sign; mineral buildup blocks water from reaching the grounds evenly.
Some machines have a descale light or alert that turns on when minerals reach a certain level. If yours has one, descale as soon as the light appears. If you hear unusual gurgling or sputtering sounds during brewing, that is also mineral buildup restricting water flow. Any of these is a reason to descale when ready, regardless of how long it has been since the last time.
How to descale your specific machine type
The steps vary slightly by machine type, but the basic process is the same: fill the water tank with a mixture of descaling solution and water, run it through a brew cycle without coffee grounds, then run plain water through two or three times to rinse.
Drip coffee makers: Fill the tank with equal parts descaling solution and water. Place an empty carafe on the warming plate. Start a brew cycle and let it run halfway, then turn it off and wait 15 minutes. Turn it back on and finish the cycle. Repeat with plain water only, twice, to rinse out all solution.
Single-serve pod machines (Keurig, Nespresso, etc.): Fill the water tank with descaling solution mixed according to the bottle instructions — usually one part solution to two parts water. Run the machine through a brew cycle without a pod or capsule, letting the solution go into a cup. Repeat until the tank is empty. Then fill the tank with plain water and run five to six brew cycles to rinse completely.
Espresso machines: Backflush the group head first if your machine has a 3-way solenoid valve (check your manual). Then run descaling solution through the group head into a cup for 10 seconds, stop for 10 seconds, and repeat for 5 minutes total. Flush with plain water for another 5 minutes. Soak the portafilter and basket in hot descaling solution for 15 minutes, then rinse thoroughly.
French press: Add descaling solution to hot water in the pot according to bottle instructions. Let it sit for 15 minutes, then plunge slowly. Empty and rinse the pot and plunger thoroughly with plain water several times until no solution smell remains.
Choosing the right descaling solution
Most descaling solutions are weak acids — citric acid or acetic acid — that dissolve mineral deposits without damaging metal or plastic parts. The major brands are Dripkit, Cafiza, and Dezcal; store brands from grocery chains work just as well and cost less. Do not use vinegar as a substitute, even though it is acidic. Vinegar leaves a smell and taste that is hard to rinse out completely, and some machine manufacturers void the warranty if you use it.
Check your machine's manual to see if the manufacturer recommends a specific solution. Some machines have proprietary solutions designed for their heating systems, though generic solutions work in most cases. A single bottle usually costs $5 to $10 and makes enough solution for three to five descale cycles, depending on tank size.
Water hardness and descaling frequency
Water hardness is measured in parts per million (ppm) of dissolved minerals, usually calcium and magnesium. Soft water is below 60 ppm; medium is 60 to 120 ppm; hard is 120 to 180 ppm; very hard is above 180 ppm. Your local water utility publishes this number in their annual water quality report, which you can find on their website or request by phone.
If you have very hard water above 180 ppm, descale monthly or even every three weeks if you brew daily. Hard water (120–180 ppm) needs monthly descaling. Medium water (60–120 ppm) needs descaling every two months. Soft water (below 60 ppm) can go three months between descales. If you use filtered water or a water softener, you can extend the interval to four to six months.
What happens if you never descale
Mineral buildup accumulates inside the heating element, tubes, and spray head. Over weeks and months, it restricts water flow so much that the machine cannot heat water to the right temperature or distribute it evenly over the grounds. The coffee tastes weak and bitter because some grounds are over-extracted and others are under-extracted.
Eventually the heating element fails because minerals trap heat and cause it to overheat. Repair or replacement costs $50 to $150 or more, depending on the machine. A $30 bottle of descaling solution used regularly costs far less than replacing the machine. Descaling is the single cheapest maintenance task you can do to extend your machine's life.
Descaling on a schedule you will actually follow
The easiest way to remember is to descale on the same day each month — the first of the month, or the day you pay rent, or your birthday. Set a phone reminder for that date. If you brew coffee daily and have hard water, set the reminder for the first and fifteenth of each month.
Alternatively, descale whenever you buy a new bag of coffee beans. If you go through a bag every two weeks, you will descale roughly every month. If you go through a bag every six weeks, you will descale every six weeks, which is fine for medium-hardness water.
Frequently Asked Questions
Can I use vinegar instead of descaling solution?
Vinegar is acidic and will dissolve minerals, but it leaves a strong smell and taste that is difficult to rinse out completely. Many machine manufacturers also void the warranty if you use vinegar. Descaling solution costs only a few dollars and is designed to rinse cleanly, so it is worth the small extra cost.
What if I descale too often?
Descaling too often will not damage your machine. The solution is mild and designed to be safe for repeated use. If you have soft water and descale every month instead of every three months, your machine will straightforward be cleaner than necessary. There is no downside to descaling more often than required.
Do I need to descale if I use filtered water?
Filtered water has fewer minerals than tap water, so you can extend the descaling interval. If your filter removes hardness minerals, you may only need to descale every four to six months instead of every one to three. However, filters do not remove all minerals, so you still need to descale periodically. Check your filter's specifications to see what it removes.
How long does a descale cycle take?
Most descale cycles take 15 to 30 minutes total, including the initial run with solution, the waiting period, and the rinse cycles with plain water. Espresso machines take longer — usually 20 to 30 minutes — because you need to backflush the group head and soak the portafilter. Plan for about half an hour and you will not be caught off guard.
Will descaling fix a machine that is already broken?
If your machine will not turn on or heat water at all, descaling will not fix it — the damage is already done. Descaling works best as prevention, run regularly before problems start. If your machine is slow but still works, descaling may restore it to normal speed. If it is completely dead, you will need repair or replacement.