The Aqua One Reflex 26 takes the Aqua One Sponge 126s (25126S) for Reflex 26 as its filter media; Australian sellers list it from A$7.88 as of 30 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your aquarium filter
Aqua One Reflex 26
Aquarium filter
Confirmed against Aqua One's listConfirmed against Aqua One's own compatibility list
Not yours? Change
Takes the 25126S filter media
Sponge 126s (25126S) for Reflex 26 · 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 25126S
Filter media · check the code on your old filter.
Other Aqua One aquarium filters and their replacement media
The 25126S fits the Reflex 26 only. These Aqua One models take a different filter media:
GenuineGenuine Aqua One
$7.88
Aquarium Spare Parts · 30 OctLowest genuine · Aquarium Spare Parts · checked 30 Oct
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 · $7.88
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Other parts this aquarium filter takes
- Aqua One Ceramic Cartridge 127c (25127C) for Reflex 26 and Reflex 35Open Aquarium Spare Parts$4.00
The biological media. Separate from the filter media. Reduces ammonia and nitrite, via the bacteria that live on it (biological media).
- Aqua One Carbon Cartridge 126c (25126C) for Reflex 26 and Reflex 35Open Aquarium Spare Parts$9.88
The carbon filter. Separate from the filter media. Reduces dissolved waste, odours and discolouration (activated carbon). Replace every 2 months.
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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 Reflex 26
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Unplug all the aquarium's equipment, then lift off the light unit and lid and put them somewhere safe.
- 2Open the filter compartment and take out the sponge and the cartridges (carbon, and ceramic if your tank has one).
- 3Take some water out of the aquarium and rinse the sponge and cartridges in it. Aqua One says never to rinse the sponge under the tap, as that kills the beneficial bacteria. If needed, siphon waste out of the filter chambers.
- 4Put the sponge back, or fit a new one once the old one blocks up or breaks down.
- 5Refit everything, replace the lid and light unit, check your hands and plugs are dry, then turn the power back on and check the equipment over the next half hour.
Every number this part goes by
- Retail name:
- 126S
- Retail name:
- 25126S
Sellers list any of these; they are the same part.
About your Aqua One Reflex 26
Aqua One aquarium filter — Reflex aquarium (discontinued). Its filter media is the Sponge 126s (25126S) for Reflex 26, part 25126S.
Also in this aquarium filter: Aqua One Ceramic Cartridge 127c (25127C) for Reflex 26 and Reflex 35, Aqua One Carbon Cartridge 126c (25126C) for Reflex 26 and Reflex 35 (every 2 months).
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 Reflex 26?
- The Aqua One Reflex 26 takes the Aqua One Sponge 126s (25126S) for Reflex 26.
- Where can I buy the 25126S in Australia?
- We track 1 Australian seller for the 25126S; the lowest listed price when we last checked was A$7.88 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
- How do I fit the 25126S in an Aqua One Reflex 26?
- 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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