Replacing a PUR filter takes about five minutes and costs between $25 and $40 per cartridge, depending on the model
Most PUR filters twist or slide out of their housing, then a new one twists or slides back in. The exact motion depends on whether you have a faucet-mounted filter, a pitcher, an under-sink system, or a refrigerator model — each one works slightly differently, but the principle is the same. You do not need tools, and you do not need to turn off your water.
The hardest part is usually finding the right replacement cartridge for your specific PUR model. PUR makes dozens of versions, and they are not interchangeable. Once you have the right cartridge, the swap itself is straightforward.
Key Takeaways
- Check your PUR model number on the device itself or in your manual to order the correct replacement cartridge — they are not universal across PUR products.
- Faucet-mounted filters unscrew by hand; pitchers and under-sink systems usually have a button or lever that releases the old cartridge.
- Rinse the new cartridge under cold water for 5 to 10 seconds before installing it, then run water through for 5 seconds to flush the system.
- Most cartridges last 2 to 3 months with normal household use, though heavy use or poor water quality can shorten that window.
Find your PUR model and the right cartridge
The first step is identifying which PUR system you own. Look on the device itself for a model number — it is usually printed on a sticker or label. Common models include the PUR Classic (faucet-mounted), PUR Plus (faucet-mounted with extra filtration), PUR Pitcher, PUR Advanced Under Sink, and PUR Refrigerator Filter.
Once you have the model number, go to the PUR website or check the manual that came with your system. Search for that model and look for "replacement filters" or "cartridges." PUR cartridges are labeled by model — for example, PUR Faucet Filter Replacement Cartridge or PUR Pitcher Replacement Filter. Buying the wrong cartridge will not fit, so take the time to match it exactly.
You can also call PUR customer service at 1-800-PUR-PURE (1-800-787-7873) and give them your model number. They will tell you the exact cartridge you need and where to buy it.
How to replace a faucet-mounted PUR filter
Faucet-mounted filters screw onto the end of your tap. To remove the old one, grip the filter housing (the plastic part) with one hand and turn it counterclockwise. It will unscrew by hand — you do not need a wrench. Keep turning until it comes free. Some water may drip, so have a towel ready.
Before you install the new cartridge, rinse it under cold water for 5 to 10 seconds. This removes loose carbon dust from manufacturing. Then screw the new filter onto the faucet by hand, turning clockwise until it is snug. Do not over-tighten — hand-tight is enough.
Run water through the filter for about 5 seconds to flush out any remaining particles. The water may look slightly cloudy or gray at first; this is normal and will clear after a few seconds of flow.
How to replace a PUR pitcher filter
PUR pitchers have a cartridge that sits inside the top of the pitcher. To remove it, lift the filter basket (the plastic piece at the top) straight up and out of the pitcher. The cartridge is attached to the underside of the basket. Look for a button or tab on the cartridge — press or pull it to release the old filter from the basket.
Rinse the new cartridge under cold water for 5 to 10 seconds, then snap it into the filter basket until you hear or feel a click. Place the basket back into the pitcher and fill it with tap water. Let the water run through the filter into the pitcher below — this flushes the system. Discard the first pitcher of filtered water and use the second pitcher onward.
Some PUR pitchers have a cartridge that you straightforward pull straight out instead of pressing a button. Check your manual if you are unsure which type you have.
How to replace an under-sink PUR filter
Under-sink systems have a filter cartridge housed in a canister beneath your sink. Locate the canister — it is usually a white or clear plastic cylinder connected to your water line. Look for a button or lever on the side or top of the canister. Press the button or flip the lever to release the locking mechanism, then unscrew the canister by hand, turning counterclockwise.
Water will drain out when you open it, so place a bucket or towel underneath. Once the canister is open, lift out the old cartridge and set it aside. Rinse the new cartridge under cold water for 5 to 10 seconds, then place it inside the canister. Screw the canister back on by hand, turning clockwise until it is snug, then press the button or flip the lever to lock it in place.
Run water through the filtered tap for about 30 seconds to flush the system. Some water may look slightly discolored — this is normal and will clear.
How to replace a PUR refrigerator filter
Refrigerator filters are located inside the fridge, usually in the upper right corner or at the base of the unit. Open your refrigerator and locate the filter cartridge — it is a cylindrical plastic piece. Look for a button or twist mechanism on the cartridge itself.
If your filter has a button, press it to release the cartridge and pull it straight out. If it has a twist mechanism, turn it counterclockwise by hand until it comes free. Rinse the new cartridge under cold water for 5 to 10 seconds, then insert it into the slot and either push it in until it clicks or turn it clockwise until it locks. Run water from the refrigerator dispenser for 30 seconds to flush the system.
Some refrigerator filters require you to reset a filter indicator light on the fridge's control panel. Check your manual for the reset procedure — it usually involves holding a button for a few seconds.
When to replace your PUR filter
Most PUR cartridges are rated for 100 gallons of water or about 2 to 3 months of use in a typical household. If you use more water or have poor water quality, the filter may clog faster. Many PUR systems have an indicator light or a filter status window that tells you when replacement is due.
If your filtered water starts to taste or smell off, or if the flow slows noticeably, the filter is likely saturated and needs replacement. Do not wait for the indicator — replace it when you notice a change. A clogged filter stops working and can harbor bacteria if left too long.
Keep replacement cartridges on hand so you are not without filtered water when the time comes. Most people buy them in packs of two or three to save money and may support they always have a spare.
Frequently Asked Questions
Do I need to turn off the water before replacing an under-sink filter?
No. You can replace an under-sink filter with the water on. When you open the canister, water will drain into a bucket or towel, but the system is designed to handle this. If you prefer to avoid the mess, you can turn off the water valve under the sink before opening the canister.
Can I use a PUR pitcher cartridge in a faucet filter?
No. PUR cartridges are model-specific and will not fit across different product lines. A pitcher cartridge will not screw onto a faucet, and an under-sink cartridge will not fit in a pitcher. Always match the cartridge to your exact model.
What if water is leaking from my filter after I replace it?
Check that the cartridge is fully seated and locked in place. For faucet filters, make sure it is screwed on tightly. For under-sink systems, confirm the canister is screwed on and the locking button or lever is engaged. If it still leaks, the cartridge may be defective — try a new one.
Is the cloudy water after replacement safe to drink?
Yes. The cloudiness is usually air bubbles or loose carbon particles from the new filter. Run water through for 10 to 15 seconds and it will clear. You can drink the water once it looks normal.
How much does a PUR replacement cartridge cost?
Prices vary by model and where you buy them. Faucet filters typically cost $25 to $35 per cartridge, pitcher filters $15 to $25, and under-sink cartridges $30 to $50. Buying in multi-packs usually costs less per cartridge than buying single replacements.