The Dreame L40s Ultra takes the Dreame Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s) (part DRE-RHF21) as its filter; replace it every 3 months; Australian sellers list it from A$3.66 as of 5 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your robot vacuum
Dreame L40s Ultra
Robot vacuum
Confirmed against Dreame's listConfirmed against Dreame Australia's compatibility list
Not yours? ChangeSave it · remind me every 3 months
Takes the DRE-RHF21 filter
Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s) · replace every 3 months · check the code printed on your old filter before ordering.
Your robot vacuum
Robot vacuum
Confirmed against Dreame's listConfirmed against Dreame Australia's compatibility list
Takes the DRE-RHF21
Filter · every 3 months · check the code on your old filter.
Other Dreame robot vacuums that take the DRE-RHF21
GenuineGenuine Dreame
$39.95
Robot Specialist · 22 OctLowest genuine · Robot Specialist · checked 22 Oct
CompatibleCompatible option
$3.66 each
6-pack $21.96
Amazon AU · 5 OctAmazon AU · checked 5 Oct
Check sellerCheck seller details
Genuine: made by Dreame. Compatible: another brand. Check certification on the seller's page.Genuine is made by Dreame. Compatible is made by another brand. Check the seller's certification details before choosing.
Lowest compatibleLowest compatible price · $3.66 each · 6-pack $21.96
Amazon AU. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Other parts this robot vacuum takes
- Dreame Dust Bag 3L (Aqua10 / Aqua20, Matrix10 Ultra, L10s Pro Ultra Heat, X40 / X50 / X60 Ultra, L40s, L30 Ultra S, L60 Ultra)Open Amazon AU$2.38 each · 6-pack $14.28
The dust bag. Separate from the filter. Replace every 2 months.
Compare 2 sellers - Dreame Mop Pad (L10 / L10s / L20 / L30 / L40 / L40s, X40 / X50 / X60 Ultra, Matrix10 Ultra, D20 Pro Plus)Open eBay AU$3.25 each · 4-pack $13.00
The mop cloth. Separate from the filter. Replace every 6 months.
Compare 6 sellers - Dreame Side Brush (Aqua10, X40 Ultra, X50 Ultra, L40s Ultra, L40s Pro Ultra)Open Amazon AU$1.67 each · 6-pack $10.02
The side brush. Separate from the filter. Replace every 3 months.
Compare 4 sellers
Compare 3 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Usually every 3 months. The app reminds you when it is due.
After replacing: Reset the filter timer under Maintenance in the Dreame app.
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 3 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the filter in your Dreame L40s Ultra
Watch the guide or follow the steps.
- 1Lift the robot's top lid and pull the dust box out by its handle.
- 2Press the clip on the back of the box and lift the old filter off.
- 3Clip the new filter on with the pleats facing the box, close the box and slide it back until it clicks.
- 4In the Dreame app open Maintenance, tap Filter and choose Reset.
Every number this part goes by
- Retail name:
- DRE-RHF21
- Retail name:
- RHF21
Sellers list any of these; they are the same part.
About your Dreame L40s Ultra
Dreame robot vacuum, robot vacuum — L series. Its filter is the Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s), part DRE-RHF21, changed every 3 months.
Also in this robot vacuum: Dreame Dust Bag 3L (Aqua10 / Aqua20, Matrix10 Ultra, L10s Pro Ultra Heat, X40 / X50 / X60 Ultra, L40s, L30 Ultra S, L60 Ultra) (every 2 months), Dreame Mop Pad (L10 / L10s / L20 / L30 / L40 / L40s, X40 / X50 / X60 Ultra, Matrix10 Ultra, D20 Pro Plus) (every 6 months), Dreame Side Brush (Aqua10, X40 Ultra, X50 Ultra, L40s Ultra, L40s Pro Ultra) (every 3 months).
Where the model number is: Turn the robot over: the model name and serial are on the label on the underside. The model name is also on the top lid of most robots.
Fits these 7 Dreame models
Common questions
- Which filter fits the Dreame L40s Ultra?
- The Dreame L40s Ultra takes the Dreame Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s) (part DRE-RHF21). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Dreame L40s Ultra?
- Every 3 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the DRE-RHF21 in Australia?
- We track 3 Australian sellers for the DRE-RHF21; the lowest listed price when we last checked was A$3.66 at Amazon AU. Prices are re-checked daily and dated on this page.
- How do I fit the DRE-RHF21 in a Dreame L40s Ultra?
- 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?
- A clogged filter loses suction, worn brushes miss edges, and a stale mop cloth smears rather than cleans.
- How do I reset the reminder?
- Reset the filter timer under Maintenance in the Dreame app.
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