The OASE BioPress Set 4000 takes the OASE replacement foam set BioPress 4000 (part 15558) as its foam set; Australian sellers list it from A$45.00 as of 28 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your pond filter
OASE BioPress Set 4000
Pond filter
Confirmed against OASE's listConfirmed against OASE's own compatibility list
Not yours? Change
Takes the 15558 foam set
replacement foam set BioPress 4000 · check the code on your old part before ordering.
Your pond filter
Pond filter
Confirmed against OASE's listConfirmed against OASE's own compatibility list
Takes the 15558
Foam set · check the code on your old part.
Other OASE pond filters and their foams and parts
The 15558 fits the BioPress Set 4000 only. These OASE models take a different foam set:
GenuineGenuine OASE
$71.50
The Fish Works · 28 OctLowest genuine · The Fish Works · checked 28 Oct
CompatibleCompatible option
$45.00
The Fish Works · 28 OctThe Fish Works · checked 28 Oct
Check sellerCheck seller details
Genuine: made by OASE. Compatible: another brand.Genuine is made by OASE. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $45.00
The Fish Works. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 3 listings from 2 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
Opens The Fish Works in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it when it is worn or torn; OASE lists the foams as wear parts and gives no interval.
How to change the foam set in your OASE BioPress Set 4000
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Switch off the filter pump and unplug the unit.
- 2Disconnect the hoses, open the closing clamps and lift off the cover with the foam package. On the BioPress 4000, hold the container down at the hold-down element.
- 3Turn the cover upside down on a soft surface, undo the nut on the pulling rod (hold the rod with pliers), take off the press ring and pull off the foams.
- 4Push the new foams on so the pulling rod sits in their recess, refit the press ring rod-guide down and tighten the nut. On the 6000 and 10000, check the meshed tube sits fully inside the ring.
- 5Check the cover seal, press the cover on until the clamps engage, reconnect the hoses and run a quick clean with the cleaning handle before normal use.
Every number this part goes by
- Retail name:
- 11OS032
- Retail name:
- 15558
- Retail name:
- BioPress 4000 foam set
- Retail name:
- Biopress 4000 sponge set
Sellers list any of these; they are the same part.
About your OASE BioPress Set 4000
OASE pond filter — BioPress Set pressure filter. Its foam set is the replacement foam set BioPress 4000, part 15558.
Where the model number is: The model is on the label on the filter's lid or side (OASE FiltoClear 13000, PondMAX PF4500UV), and on the box. Switch the pump and any UV-C lamp off at the power point before you open the filter.
Fits this OASE model
OASE1 model
Common questions
- Which foam set fits the OASE BioPress Set 4000?
- The OASE BioPress Set 4000 takes the OASE replacement foam set BioPress 4000 (part 15558).
- Where can I buy the 15558 in Australia?
- We track 2 Australian sellers for the 15558; the lowest listed price when we last checked was A$45.00 at The Fish Works. Prices are re-checked daily and dated on this page.
- How do I fit the 15558 in an OASE BioPress Set 4000?
- 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A torn or worn-out foam lets dirt through to the pump and the water clouds.
Something looks wrong with the BioPress Set 4000 match? . Reports go to a person, not a bot.