Shark BU3521 pre-filter
The Shark BU3521 takes the Shark Handheld Vacuum Pre-Motor Filter (XPRFIW1000) (part XPRFIW1000) as its pre-filter; replace it every 12 months; Australian sellers list it from A$29.99 as of 1 August 2026. Fitment confirmed against the manufacturer's compatibility list.
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Your vacuum cleaner
Shark BU3521
Stick vacuum · Clean & Empty
Takes this filter
Handheld Vacuum Pre-Motor Filter (XPRFIW1000)
XPRFIW1000
The right pre-filter for BU3521
Shark Handheld Vacuum Pre-Motor Filter (XPRFIW1000)
- Replace every 12 months
- Fresh-air filter
- Fits 1 model
Shark's genuine XPRFIW1000 for the BU3521: the foam and felt pre-motor filters that sit above the dust cup. Shark's part page lists the fit; both filter stages are washable and the part is for when they no longer come clean or are damaged.
- Fits
- BU3521
- Washable
- Yes - rinse monthly (pre-motor) or yearly (post-motor), dry 24 h
- Shark part
- XPRFIW1000
Every number this part goes by
Where to buy
Every seller we track for this part, cheapest first. Genuine is the manufacturer's own part; compatible is a third-party filter made to fit. Prices are re-checked daily where the seller publishes them. Last checked 1 August 2026.
How long it lasts
Replace every 12 months.
After fitting: Shark: rinse filters in water only (no soap), squeeze out and air-dry for at least 24 hours before refitting; a damp filter can damage the motor. No reset.
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point of the filter.
Not due yet?
This filter is due every 12 months. We'll email you when it's time — free, no spam.
Fitting it
A few minutes, no tools. Watch it done, then follow the steps.
- 1Switch the vacuum off and take it off the charger or unplug it.
- 2Press the release and take the dust cup off the main body; empty it.
- 3Lift the foam and felt filters out of the housing on top of the dust cup and fit the new felt first, then the foam.
- 4Refit the dust cup until it clicks. Rinse the foam and felt monthly and let them dry 24 hours.
About your Shark BU3521
Shark vacuum cleaner, stick vacuum — Clean & Empty. Its pre-filter is the Handheld Vacuum Pre-Motor Filter (XPRFIW1000), part XPRFIW1000, changed every 12 months.
Checking the model number: The rating label is on the underside or the back of the main body; the bag or filter type is usually printed on the old part.
Fits these models
Shark1 model
Common questions
- Which pre-filter fits the Shark BU3521?
- The Shark BU3521 takes the Shark Handheld Vacuum Pre-Motor Filter (XPRFIW1000) (part XPRFIW1000). Compatible filters made to the same specification also fit.
- How often should I replace the pre-filter in my Shark BU3521?
- 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 XPRFIW1000 in Australia?
- We track 1 Australian seller for the XPRFIW1000; the lowest listed price when we last checked was A$29.99 at shark_au. Prices are re-checked daily and dated on this page.
- How do I fit the XPRFIW1000 in a Shark BU3521?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
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