The Winix C545 takes the Winix GA Filter Set (C545): HEPA + 4 carbon (part GA-FILTER(AU)) as its filter; replace it every 12 months; Australian sellers list it from A$149.00 as of 22 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your air purifier
Winix C545
Air purifier
Confirmed against Winix's listConfirmed against Winix Australia's compatibility list
Not yours? ChangeSave it · remind me every 12 months
Takes the GA-FILTER(AU) filter
GA Filter Set (C545): HEPA + 4 carbon · replace every 12 months · check the code printed on your old filter before ordering.
Your air purifier
Air purifier
Confirmed against Winix's listConfirmed against Winix Australia's compatibility list
Takes the GA-FILTER(AU)
Filter · every 12 months · check the code on your old filter.
Other Winix air purifiers and their filters
The GA-FILTER(AU) fits the C545 only. These Winix models take a different filter:
GenuineGenuine Winix
$149.00
Ausclimate · 22 OctLowest genuine · Ausclimate · checked 22 Oct
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Winix. Compatible: another brand. Check certification on the seller's page.Genuine is made by Winix. Compatible is made by another brand. Check the seller's certification details before choosing.
Lowest price · $149.00
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AUD, before delivery. Each price shows when it was checked.
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How long it lasts
Usually every 12 months. The filter light is a reminder, not a water-quality sensor.
After replacing: After fitting, hold the filter reset button until the filter light goes out.
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 12 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the filter in your Winix C545
Watch the guide or follow the steps.
- 1Switch the purifier off and unplug it.
- 2Pull the front panel off from the bottom edge and lift out the old filters in order: pre-filter, carbon filter, then HEPA filter.
- 3Take the new filters out of their plastic bags and fit them the same order and way round — HEPA at the back, carbon in front, pre-filter last.
- 4Refit the panel, plug in, and hold the filter reset button until the filter light goes out.
Every number this part goes by
- Retail name:
- GA-FILTER
- Retail name:
- GA-FILTER(AU)
Sellers list any of these; they are the same part.
About your Winix C545
Winix air purifier, air purifier — C545 4-stage. Its filter is the GA Filter Set (C545): HEPA + 4 carbon, part GA-FILTER(AU), changed every 12 months.
Where the model number is: Look at the rating label on the back or the underside of the purifier: the model is the type code (AUS-1250AZPU, WXAP800W, 5500-2), not the marketing name. The filter pack code (GT, GI, GQ…) is printed on the old filter's frame.
Fits these 1 Winix model
Winix1 model
Common questions
- Which filter fits the Winix C545?
- The Winix C545 takes the Winix GA Filter Set (C545): HEPA + 4 carbon (part GA-FILTER(AU)). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Winix C545?
- Every 12 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the GA-FILTER(AU) in Australia?
- We track 1 Australian seller for the GA-FILTER(AU); the lowest listed price when we last checked was A$149.00 at Ausclimate. Prices are re-checked daily and dated on this page.
- How do I fit the GA-FILTER(AU) in a Winix C545?
- 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?
- After fitting, hold the filter reset button until the filter light goes out.
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