The Aqua One AquaReef 195 takes the Aqua One Sponge 421s (25421S) for AquaReef 195 as its filter media; Australian sellers list it from A$15.88 as of 7 November 2026. Fitment confirmed against the manufacturer's compatibility list.
Your aquarium filter
Aqua One AquaReef 195
Aquarium filter
Confirmed against Aqua One's listConfirmed against Aqua One's own compatibility list
Not yours? Change
Takes the 25421S filter media
Sponge 421s (25421S) for AquaReef 195 · check the code printed on your old filter before ordering.
Your aquarium filter
Aquarium filter
Confirmed against Aqua One's listConfirmed against Aqua One's own compatibility list
Takes the 25421S
Filter media · check the code on your old filter.
Other Aqua One aquarium filters and their replacement media
The 25421S fits the AquaReef 195 only. These Aqua One models take a different filter media:
GenuineGenuine Aqua One
$15.88
Aquarium Spare Parts · 7 NovLowest genuine · Aquarium Spare Parts · checked 7 Nov
CompatibleCompatible option
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No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Aqua One. Compatible: another brand.Genuine is made by Aqua One. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $15.88
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AUD, before delivery. Each price shows when it was checked.
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How long it lasts
Replace it when it clogs, breaks down or no longer holds its shape, Aqua One says; until then rinse it in a bucket of aquarium water each time you clean the filter.
How to change the filter media in your Aqua One AquaReef 195
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Turn off the return pump and heaters before you work in the sump.
- 2Take the sponge out of the sump's filter section.
- 3Rinse the sponge in water you have taken out of the aquarium during the water change, never in tap water.
- 4Put the sponge back, or fit a new one once the old one blocks up or breaks down.
- 5Turn the pump and heaters back on and check that the water level is above the minimum operating mark.
Every number this part goes by
- Retail name:
- 25421S
- Retail name:
- 421S
Sellers list any of these; they are the same part.
About your Aqua One AquaReef 195
Aqua One aquarium filter — AquaReef aquarium (discontinued). Its filter media is the Sponge 421s (25421S) for AquaReef 195, part 25421S.
Where the model number is: The model is on the filter's lid, motor head or a label on its side (Fluval 307, Eheim Classic 2215). For a tank with a built-in filter, use the tank's name.
Fits this Aqua One model
Aqua One1 model
Common questions
- Which filter media fits the Aqua One AquaReef 195?
- The Aqua One AquaReef 195 takes the Aqua One Sponge 421s (25421S) for AquaReef 195.
- Where can I buy the 25421S in Australia?
- We track 1 Australian seller for the 25421S; the lowest listed price when we last checked was A$15.88 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
- How do I fit the 25421S in an Aqua One AquaReef 195?
- No tools, a few minutes: 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- Spent carbon stops removing odours and discolouration, and clogged pads slow the flow, so the filter moves less water through the tank.
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