As an Amazon Associate, Barista Life earns from qualifying purchases.
Keurig's charcoal water filter should be replaced every 2 months or every 60 tank refills, whichever comes first, and the swap takes two minutes: soak the new cartridge in water for 5 minutes, rinse it 60 seconds, drop it into the filter holder, and click the holder back into the reservoir. The filter is the cheapest insurance a Keurig gets: better-tasting coffee and slower scale buildup, which is fewer of the descale-and-repair cycles that kill these machines.
The 2-minute swap
| Step | Do |
|---|---|
| 1 | Soak the new charcoal cartridge in a cup of water, 5 minutes |
| 2 | Rinse it under the tap for 60 seconds |
| 3 | Rinse the filter holder's mesh; pop the old cartridge out, new one in |
| 4 | Set the reminder dial two months ahead, click the holder back into the tank |
Replacement cartridges come in 6 and 12 packs; a 12-pack is two years of swaps. Check your model first, because the filter holder differs: most standard reservoirs take the classic tall holder, while K-Supreme and some newer models use a shorter side-reservoir version, and a few compact models (K-Mini class) have no filter at all.
What the filter does and does not do
Does: strips chlorine taste and some odor, so pods taste like coffee instead of pool water, and reduces the sediment feeding scale. Does not: soften water or stop descaling. Filtered hard water still deposits minerals on the heater, which is why the filter complements, never replaces, the quarterly descale in our Keurig descale guide. Households on heavily chlorinated city water notice the taste difference immediately; well-water households usually benefit more from descaling frequency than filtration.
Forgot it for a year? Do this
An ancient filter is worse than none: saturated charcoal stops filtering and can seed growth in the tank. Toss it, wash the reservoir and holder with hot soapy water, run a descale cycle for the scale that built up meanwhile, then start fresh cartridges on the 2-month rhythm. If the machine also runs slow or short, the full symptom fixes live in the troubleshooting hub.
Related reading
FAQ
How often should I change my Keurig water filter? Every 2 months or 60 tank refills. Set the dial on the holder when you swap so the date argues for itself.
Do I really need the Keurig water filter? On chlorinated city water, it is the difference you can taste. It also slows scale, but it never replaces descaling.
Why does my Keurig not have a filter holder? Compact models like the K-Mini class ship without one. Descale a little more often and let good pods do the rest.
Never miss a cycle: the free one-page Machine Maintenance Calendar (PDF) puts every daily, monthly, quarterly, and yearly task for espresso machines, drip, Keurig, and moka pots on a card you can tape inside a cabinet.
Barista Life runs on coffee people. Browse the Barista Life shop to support the site.