Blue Pure 121 Replacement Filters

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To maintain optimum air cleaning performance, the main filter in your Blue Pure 121 air purifier by Blueair should be replaced every 6 to 12 months. The indicator light on the one-touch button of your Blue Pure 121 turns red when it’s time to change the filter, with a yellow warning light giving you plenty of advance notice.

blue pure 121 filters



Blue Pure 121 Foldable Replacement Filter

NOTE: This filter will not fit the original Blue Pure 121 units that were sold in the US. It only fits the new 121 models with the removable folding filter.

Blue Pure 121 Foldable Particle+Carbon Combo Filter – $139.99 CAD



Blue Pure 121 Fabric Pre-Filter

Blue Pure 121 Fabric Pre-Filter - $14.99 CAD

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Blue Pure 121 Filter Specifications


Blue Pure 121 Particle+Carbon Combo Filter
Filter Dimensions (folded) 20 x 19.5 x 3.0 inches
Filter Weight 7.1 lbs.
Particle Filtration Certified efficiency of 99.97% for airborne particles down to 0.1 microns, including dust, pollen, pet dander, mold spores and bacteria
Filter Type Gradient structured filter with thermally bonded polypropylene and polyethylene fibres free of chemicals and binders.
Effective Filter Area 52 sq. ft.
Filter Media Thickness 0.024 inches
Filter Pleat Separators Non-hazardous, EVA based, VOC free, UV resistant
Gas and Odor Filtration Able to handle chemicals and gases
Type of Carbon Porous activated carbon pellets
Carbon Weight 2.5 lbs.
Filter Life 6 to 12 months

How to Replace the Filter In Your Blue Pure 121 Air Purifier

Changing the filter in your Blue Pure 121 air purifier is a breeze:
1. Unplug your Blueair 121.
2. Click the buttons on the side of the unit to release the top half of the air purifier from the bottom half.
3. Remove the old filter from the lower housing and discard.
4. Gently unfold the new filter and place inside the housing.
5. Firmly press the top of the unit onto the base until you hear 2 clicks.
6. Plug the Blueair 121 back in and press the one-touch button to turn it on.
7. Reset the unit by pressing and holding the one-touch button for five seconds and then releasing it. The indicator light will flash for five seconds, and then change from red to white.


Modern Alchemy Air Purifiers is 100% Canadian-owned, operating out of Ottawa, Canada. We proudly serve Vancouver, Calgary, Edmonton, Regina, Winnipeg, Toronto, Montreal, Halifax, St. John’s and all points in between.

If you have any questions about which Blueair replacement filter is required for your air purifier or are trying to locate a replacement filter for a Blueair model that is not listed, please contact us at:

Phone: 613-894-0331
Toll Free: 1-877-GO-7-PURE (1-877-467-7873)
Email: info@modernalchemyair.com

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