Replace the filter cartridge every two months or when water flow slows

Your Keurig's water filter sits inside the reservoir and catches sediment, chlorine, and minerals that affect taste and machine lifespan. When it clogs, you'll notice water takes longer to heat or the brewer stops mid-cycle. Replacing it takes about five minutes and costs $8 to $15 per cartridge. Most Keurig owners need a new filter every 60 days if they use the machine daily, or every two to three months with lighter use.

The filter cartridge is not the same as the mesh basket at the bottom of the reservoir — that one never needs replacing. The cartridge is the white or tan cylinder that hangs inside the water tank itself. If you've never replaced yours, it's likely still the original one that came with the machine, and it's past due.

Key Takeaways

  • The filter cartridge hangs from the top of the water reservoir and should be replaced every two months with daily use.
  • You need a replacement cartridge (Keurig part number varies by model) and the mesh basket that comes attached to it.
  • The old cartridge pulls straight down and out; the new one slides up into the same slot with the basket facing downward.
  • Run water through an empty brewer twice after installation to rinse the new filter before making coffee.

What you need before you start

Buy the correct cartridge for your Keurig model. Keurig sells several types: the standard charcoal filter cartridge fits most machines made after 2012, while older models and some commercial brewers use different cartridges. Check your machine's manual or the Keurig website by model number to confirm which one you need.

You can buy cartridges at Target, Walmart, Amazon, or directly from Keurig's website. A six-pack costs about $35 to $40, which works out cheaper per cartridge than buying singles. The cartridge comes with a mesh basket already attached to the top — you do not buy these separately.

Step-by-step filter replacement

Step 1: Empty and remove the water reservoir. Unplug the brewer and lift the reservoir straight up and away from the machine. Pour out any remaining water into a sink. You do not need to empty it completely, but it's easier to work with when mostly dry.

Step 2: Locate and pull out the old cartridge. Look inside the reservoir at the top. You'll see a white or tan cylinder hanging down from the lid. Grab it firmly and pull straight down. It should come free with a gentle tug — if it's stuck, wiggle it side to side while pulling. The mesh basket attached to the top will come out with it.

Step 3: Rinse the reservoir. While the cartridge is out, rinse the inside of the reservoir with clean water. This removes any sediment or debris that collected at the bottom. You do not need to use soap or scrub hard — a quick rinse is enough.

Step 4: Insert the new cartridge. Take the new cartridge with its mesh basket attached. Hold it so the mesh basket faces downward (toward the bottom of the reservoir). Slide it up into the slot where the old one came from. Push it up until it seats firmly — you should feel it click or lock into place. The basket should hang about an inch below the lid opening.

Step 5: Refill and run two brew cycles. Fill the reservoir with fresh water and reattach it to the machine. Plug the brewer back in. Place an empty mug on the drip tray and run a full brew cycle without inserting a K-Cup. Let the water drain into the mug. Repeat this a second time. This rinses the new filter and removes any loose charcoal dust from manufacturing.

Signs your filter needs replacing sooner

If your water tastes off, smells like chlorine, or looks cloudy even after the filter is new, the old one may have been clogged longer than expected. Hard water areas (where you see white mineral buildup on faucets) may need filter changes every four to six weeks instead of two months.

If water barely trickles out or the brewer shuts off mid-brew, the filter is completely blocked. Replace it when ready — a clogged filter forces the heating element to work harder and can shorten the machine's life. Do not try to clean or reuse the old cartridge; they are not designed to be washed and reused.

What to do with the old cartridge

Most charcoal filter cartridges can go in your regular trash or recycling bin, depending on your local rules. Some communities accept them in yard waste bins because the charcoal is organic. Check your city or county's waste guidelines if you want to recycle rather than throw away.

Keurig does not run a mail-back program for used cartridges, so you cannot send them back to the company. A few specialty recycling centers accept them, but the nearest one may be far away — for most people, trash is the practical choice.

Troubleshooting common problems

If the cartridge won't slide up into the slot, you may be inserting it upside down. The mesh basket should face downward into the reservoir, not upward toward the lid. Remove it, flip it, and try again. If it still won't fit, make sure you bought the correct cartridge type for your model.

If water still tastes like chlorine after running two rinse cycles, run two more. New filters sometimes need three to four cycles to fully set up. If the taste does not improve after that, the cartridge may be defective — contact Keurig's customer service with your receipt and they will send a replacement.

If water leaks from the reservoir after you reattach it, the cartridge may not be seated all the way up. Remove the reservoir, push the cartridge up firmly until you hear or feel it lock, and try again. A cartridge that sits too low will not seal properly.

How often to check your filter

Mark your calendar or set a phone reminder for two months after each replacement. If you use your Keurig fewer than five times a week, you can stretch it to three months. If you use it daily or have very hard water, check it at six weeks — if water flow has slowed noticeably, replace it early.

Some newer Keurig models have a filter indicator light that tells you when replacement is due. Check your manual to see if yours has this feature. Even with an indicator, physically checking the cartridge once a month takes 30 seconds and helps you catch clogs before they slow the brewer.

Frequently Asked Questions

Can I use my Keurig without a filter?

Yes, the brewer will work without a filter cartridge. However, sediment and minerals will build up inside the machine faster, affecting taste and potentially damaging the heating element over time. Using a filter extends the life of your brewer and keeps coffee tasting better.

What's the difference between the filter cartridge and the mesh basket?

The mesh basket is the small screen at the top of the cartridge that catches large particles. The cartridge itself is the white cylinder filled with charcoal that filters water. They come attached together and are replaced as one unit every two months.

Do I need to soak the new filter before using it?

No. Just insert it, fill the reservoir, and run two empty brew cycles to rinse it. Soaking is not necessary and does not improve performance. The two rinse cycles are enough to set up the charcoal and remove manufacturing dust.

Why does my water still taste bad after replacing the filter?

Run two more empty brew cycles — new filters sometimes need three to four cycles total to fully work. If taste does not improve after that, your tap water may have minerals or contaminants the filter is not designed to remove. Consider a whole-house water filter or using bottled water in your Keurig.

Can I clean and reuse the old filter cartridge?

No. Charcoal filters cannot be cleaned and reused effectively. Once the charcoal is saturated, rinsing does not restore it. Reusing a clogged filter defeats the purpose and can damage your brewer. Always replace with a new cartridge.