The Blueair Blue Pure 121 takes the Blueair Particle + Carbon filter (Blue Pure 121) (part F121PACF104507) as its filter; replace it every 6 months. Fitment confirmed against the manufacturer's compatibility list.
Your air purifier
Blueair Blue Pure 121
Air purifier
Confirmed against Blueair's listConfirmed against Blueair Australia's compatibility list
Not yours? ChangeSave it · remind me every 6 months
Takes the F121PACF104507 filter
Particle + Carbon filter (Blue Pure 121) · replace every 6 months · check the code printed on your old filter before ordering.
Your air purifier
Air purifier
Confirmed against Blueair's listConfirmed against Blueair Australia's compatibility list
Takes the F121PACF104507
Filter · every 6 months · check the code on your old filter.
Other Blueair air purifiers and their filters
The F121PACF104507 fits the Blue Pure 121 only. These Blueair models take a different filter:
GenuineGenuine Blueair
See seller
Sold by Blueair and retailersSold by Blueair and retailers
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Blueair. Compatible: another brand. Check certification on the seller's page.Genuine is made by Blueair. Compatible is made by another brand. Check the seller's certification details before choosing.
This air purifier also takes a pre-filter
- Blueair fabric pre-filter (Blue Pure 121)Open Amazon AU$27.06
Separate from the filter. Reduces hair, lint and large dust before the main filter. Replace every 12 months.
Sellers
AUD, before delivery. Each price shows when it was checked.
No Australian seller lists this part right now. Blueair has taken it off its Australian store (2026-09-28) and no Australian seller was found. Search the part code F121PACF104507 at your usual retailer.
How long it lasts
Usually every 6 months. The filter light is a reminder, not a water-quality sensor.
After replacing: Press and hold the button until the filter light goes out (about 5 seconds).
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point.
Not due yet?
Get a nudge when your filter is due — it's every 6 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the filter in your Blueair Blue Pure 121
Watch the guide or follow the steps.
- 1Switch the purifier off and unplug it.
- 2Lift the top section straight up off the base.
- 3Lift the old cylindrical filter out, unwrap the new one and drop it in.
- 4Refit the top, plug in, and hold the button until the filter light goes out.
Every number this part goes by
- Retail name:
- 104507
- Retail name:
- 121 filter
- Retail name:
- F121PACF104507
Sellers list any of these; they are the same part.
About your Blueair Blue Pure 121
Blueair air purifier, air purifier — Blue Pure. Its filter is the Particle + Carbon filter (Blue Pure 121), part F121PACF104507, changed every 6 months.
Also in this air purifier: Blueair Extra Protection Particle + Carbon filter (Blue Pure 121) (every 6 months), Blueair fabric pre-filter (Blue Pure 121) (every 12 months).
Where the model number is: The model number is on the rating label on the bottom or back of the purifier; the old filter usually has its own code printed on the frame.
Fits these 1 Blueair model
Blueair1 model
Common questions
- Which filter fits the Blueair Blue Pure 121?
- The Blueair Blue Pure 121 takes the Blueair Particle + Carbon filter (Blue Pure 121) (part F121PACF104507). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Blueair Blue Pure 121?
- Every 6 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- How do I fit the F121PACF104507 in a Blueair Blue Pure 121?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- The fan works harder for less airflow, and the carbon layer stops taking smells out well before the filter looks dirty.
- How do I reset the filter light?
- Press and hold the button until the filter light goes out (about 5 seconds).
Something looks wrong with the Blue Pure 121 match? . Reports go to a person, not a bot.