Descale Keurig Slim: Easy Steps To Follow for Cleaning

Published: 06/27/23 •  7 min read
                                             Descale Keurig Slim: Easy Steps for a Clean Machine

A Keurig coffee maker, especially the K-Slim model, is a popular kitchen appliance. It is the perfect brewer for hardcore coffee lovers who want a quick, convenient way to make a delicious cup of coffee.

However, mineral deposits from water and coffee residue can affect the coffee machine’s performance and the taste of beverages with time.

Therefore, it is important to regularly descale your Keurig coffee maker to maintain its functionality and durability.

Descaling is the process of removing mineral deposits from the internal components of a coffee maker. If left unattended, lime scale can obstruct water flow, hinder your coffee maker’s heating element, and destroy coffee’s overall taste and quality.

Descaling your Keurig coffee maker every three months or when the descale light starts flashing is necessary.

If you’re a noob and need help descaling your K-Slim, this post has the solutions to all your problems. Keep reading to know more about descaling your Keurig K-Slim.

Why Descaling Your Keurig Slim is Important?

If you’re still wondering why descaling your Keurig Slim is important, here are some important reasons to help you convince:

It Removes Mineral Deposits

Descaling is an essential process for Keurig Slim coffee makers. It helps remove mineral deposits, including calcium and lime scale, accumulating over time.

These minerals naturally exist in water and can build up inside the coffee machine. They can also block the machine’s internal components, reducing performance and longevity.

Descaling Extends Your Keurig’s Lifespan

Regularly descaling your Keurig Slim can significantly extend its lifespan while helping you enjoy years of delicious cups of coffee.

The process ensures that your machine continues functioning efficiently by removing unwanted mineral buildup and coffee residue before it becomes a more significant issue.

Improved Coffee Quality

Minerals like calcium and limescale can affect brewing, leading to inconsistent temperatures and brewing times. As a result, you get bitter or weak coffee.

Regular cleaning and descaling can prevent damage to the heating element and avoid obstruction in the water flow. Descaling also ensures that your Keurig Slim brews the most authentic and great-tasting coffee.

                                                Keurig machine dispensing freshly brewed coffee

How To Descale Keurig K-Slim?

Now that you understand the importance of descaling your Keurig K-Slim, let’s dive into the main part.

Here is a step by step guide to descale your Keurig coffee machine:

Step 1: Prepare the Keurig K-Slim before Descaling

You must perform some essential steps before you start to descale your Keurig K-slim.

What you will need

Remove the water reservoir and the drip tray. Empty both components and wash them with soapy water. Then wash the drip tray and the water reservoir under running water to clean them thoroughly.

Dry the drip tray and water reservoir before attaching them to the coffee machine.

Then, pour the entire bottle of Keurig descaling solution into the reservoir. Fill the empty descaling solution bottle with fresh water and then add water from it to the tank. This will create a 50/50 solution of descaling solution and water.

                                                    Adding Keurig solution to the Keurig machine

Note: Ensure no K-Cup pod is in the pod holder before starting the descaling process.

Step 2: Put your Keurig in Descale Mode

With the brewer prepared, follow these steps to enter descale mode and start the descaling process:

  1. Power on the Keurig K-Slim coffee maker.

  2. Place the large mug on the drip tray.

  3. Lift and lower the handle without inserting a K-Cup pod.

  4. Press and hold the 8 oz and 12 oz buttons simultaneously for 3 seconds until the descale light flashes, indicating that the brewer is now in descale mode.

                                            Keurig coffee machine flashing descale light

Step 3: Start the Descaling Process

  1. Press the brew button to start the descaling process. 

  2. The brewer will start to dispense the descaling solution.

  3. Discard the solution from the mug after each cycle.

  1. Repeat this process until the ADD WATER light illuminates. This light indicates moving on to the next step.

Step 4: Run the Rinse Cycle

Once the reservoir is empty, rinse the coffee maker thoroughly by filling it with water and running two brewing cycles without a K-Cup pod. Doing this will completely remove the descaling solution from the machine.

After rinsing, the Keurig K-Slim brewer should be ready for regular use. Repeat the descaling process every 3 months to keep your Keurig K-Slim in top-notch condition.

Keurig K-Slim: Descaling Solution Options

You can use the Keurig Descaling Solution or white vinegar when descaling your Keurig Slim coffee maker. 

Both store-bought or homemade descaling solutions can help ensure the longevity of your coffee machine while maintaining its optimal performance.

Keurig Descaling Solution

The Keurig Descaling Solution is a specially formulated solution designed specifically for use with Keurig coffee makers. It contains citric acid, effectively breaking down mineral deposits and lime scale buildup within the machine.

 Using the Keurig descaling liquid provides several benefits:

White Vinegar

Another option for descaling your Keurig Slim coffee maker is white vinegar. White vinegar is a widely available and cost-effective choice for cleaning and descaling various household appliances, including coffee makers.

Some benefits of using white vinegar for descaling include:

To descale your Keurig Slim with white vinegar, mix equal parts of white vinegar and water to fill the water tank. Run a brew cycle to allow the vinegar solution to flow through the coffee machine, breaking down the buildup.

                                                     White vinegar for descaling Keurig machine

How to Maintain Your Keurig Slim?

Apart from descaling, regular cleaning and maintenance services are also important to ensure long-lasting performance and delicious coffee from your Keurig K-Slim coffee maker.

To ensure your Keurig K-Slim lasts you a long time, here are some helpful maintenance tips:

Descale your K-slim regularly

As mentioned earlier, regular descaling every 3 months is crucial to keep your Keurig K-Slim coffee maker in optimal condition.

Descaling removes any built-up calcium deposits and ensures that the heating elements and other internal parts in contact with water function properly.

White vinegar or citric acid is another effective way to descale your Keurig K-Slim. Fill the water tank with equal parts vinegar and water, then run the machine until it has emptied the reservoir.

Use Filtered or Bottled Water

Hard water can cause calcium deposits to build up faster, thus requiring more frequent descaling. Consider using filtered water for brewing coffee to minimize the need for descaling.

Filtered water will reduce the mineral content and keep your Keurig K-Slim running smoothly.

                                                         Using bottled water to brew coffee

Changing the Water Filter

The water filter removes any impurities from the water you use for brewing coffee. A water filter improves the quality of water. As a result, the coffee quality also improves.

You must change the water filter of your Keurig K-slim every three to six months. The duration of changing the water filter can vary, depending on your settings and how often you brew coffee.

You can change the water filter by following these steps:

  1. Soak the new charcoal filter in cold water for about 5 minutes.

  2. Rinse the filter under cold water for about 60 seconds to remove any remaining particles.

  3. Insert the water filter into its holder inside the water reservoir. Ensure that it’s properly seated and secure.

  4. Fill the water tank with fresh, cold water.

                                                  Keurig water filter cartridge and water handle


To prevent limescale buildup on your Keurig machine, descale it every 3 to 6 months. Removing mineral deposits that have built up inside your Keurig can improve and enhance the quality and taste of your coffee and allows the machine to serve you for a long time.

 Although non-toxic, calcium and scale can adversely affect your brewer’s performance if left unattended.

Hopefully, this article helped you clean and descale your Keurig K-Slim so you can enjoy a good cup of coffee again. Happy brewing!

Hans Mast

Hans loves coffee and loves teaching about coffee