Where the filter sits and why it matters

Your Keurig has a water filter cartridge that lives inside the machine's water reservoir — the tank you fill every morning. The filter catches sediment, chlorine, and other particles that affect how your coffee tastes. Over time, the filter gets clogged and stops working well, so Keurig recommends changing it every two months or after about 60 brew cycles, whichever comes first.

If you skip filter changes, you'll notice your coffee tastes flat or chlorinated, and mineral buildup inside the machine can slow down brewing or cause clogs. The good news: changing the filter takes about two minutes and costs between $8 and $15 per cartridge.

Key Takeaways

  • The water filter cartridge sits inside your reservoir and needs to be replaced every two months or after roughly 60 brew cycles.
  • You must soak a new filter in cold water for 15 minutes before installing it, or it won't filter properly.
  • The filter holder clips into the bottom of the reservoir, and you remove it by twisting counterclockwise or pulling straight down depending on your Keurig model.
  • Keurig brand cartridges fit all standard models, but third-party filters are cheaper and work just as well if they match your machine's size.

What you need before you start

Grab a replacement water filter cartridge that matches your Keurig model. Keurig sells them under the name Keurig Water Filter Cartridge — they come in a pack of two or four. Check your machine's manual or the Keurig website to confirm the right size for your model, though most standard home brewers use the same cartridge.

You'll also need a bowl or cup of cold water to soak the new filter. That's it — no tools required. If you can't find the exact Keurig brand, third-party filters made for Keurig machines work fine and often cost less. Just make sure the packaging says it fits your model number.

Remove the old filter from the reservoir

Empty the water reservoir and set it on a flat surface. Look at the bottom inside the tank — you'll see a cylindrical filter holder with the cartridge inside. On most models, you twist the holder counterclockwise (lefty-loosey) until it releases, then pull it straight out. On some newer Keurigs, the holder just pulls straight down without twisting.

Once the holder is out, pull the old cartridge straight up and out of the holder. Throw it away. Rinse the holder under cold running water to clear out any loose sediment or debris, then set it aside.

Prepare and install the new filter

Take your new cartridge out of the package and place it in a bowl of cold water. Let it soak for 15 minutes — this step is important because it activates the filter material and removes air pockets. If you skip this, the filter won't work properly and your coffee will taste off.

After 15 minutes, remove the cartridge from the water and insert it into the filter holder. Push it straight down until it sits flush. Now put the holder back into the reservoir — twist it clockwise (righty-tighty) until it's snug, or push it down firmly if your model doesn't twist. Fill the reservoir with fresh water and run one full brew cycle without coffee to rinse the new filter. Discard that water and brew normally on the second cycle.

How to know when it's time to change the filter again

Most Keurigs have a small light or indicator on the water reservoir that tells you when the filter needs changing. Check your machine's display or look for a filter icon on the tank itself. If your model doesn't have an indicator, mark your calendar two months from the installation date or count your brew cycles — around 60 cups is the limit.

You can also tell by taste: if your coffee starts to taste like tap water or chlorine again, the filter is done. Some people also notice the brew cycle takes longer because mineral buildup is slowing water flow. Any of these signs means it's time to repeat the process.

Troubleshooting common filter problems

If water is leaking from the bottom of the reservoir after you install a new filter, the holder probably isn't seated all the way. Remove the reservoir, take out the filter holder, and make sure the cartridge is pushed all the way down into the holder. Then reinstall the holder firmly — it should click or feel snug when it's in place.

If your coffee still tastes bad after installing a new filter and running a rinse cycle, the filter may not have soaked long enough. Remove it, soak it for the full 15 minutes in fresh cold water, and try again. If the problem persists, your machine may need descaling to remove mineral buildup inside the brewing chamber — that's a separate process you can do with white vinegar or a Keurig descaling solution.

Frequently Asked Questions

Can I use a Keurig without a water filter?

Yes, the machine will brew without a filter installed, but your coffee will taste like tap water and mineral deposits will build up inside faster. The filter is inexpensive compared to the cost of descaling or repairing mineral damage, so it's worth using one.

What happens if I don't soak the new filter before installing it?

The filter won't work properly because air pockets prevent water from flowing through the filter material evenly. You'll get unfiltered water in your cup and the filter won't last as long. Always soak for the full 15 minutes in cold water before installing.

Do I have to buy Keurig brand filters or can I use a cheaper brand?

Third-party filters made for Keurig machines work just as well and often cost less. Make sure the packaging says it fits your specific model number. Avoid generic filters that don't list Keurig compatibility, as they may not fit or seal properly.

How do I know which filter size my Keurig uses?

Check your machine's manual or look up your model number on the Keurig website — it will tell you the correct cartridge size. Most home brewers use the standard size, but some compact or commercial models are different. When in doubt, bring your model number to a store or call Keurig's customer service.

Can I clean and reuse an old water filter?

No, water filters are designed to be replaced, not cleaned and reused. Once the filter material is saturated with sediment and chlorine, rinsing it won't restore its ability to filter. A new cartridge costs less than a few cups of coffee, so replacement is the right choice.