Aquarium filter media
Aqua One Sponge 4s (25004S) for AquaStyle 850
25004S
Fits 1 model
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GenuineGenuine Aqua One
$10.44 each
2-pack $20.88
Aquarium Spare Parts · 29 OctLowest genuine · Aquarium Spare Parts · checked 29 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 · $10.44 each · 2-pack $20.88
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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 25004S aquarium filter media
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Turn the power head off and unplug the aquarium's equipment.
- 2Remove the lid from the filter unit and lift the elbow and spray bar off the top of the power head.
- 3Take out the carbon cartridge and the black filter sponge. Rinse the sponge in a little aquarium water in a bucket, then throw that water away rather than adding it back to the tank.
- 4Put the sponge back, or fit a new one once the old one blocks up or breaks down.
- 5Refit the spray bar with its holes pointing down onto the carbon cartridge, make sure the tank is full, turn the power head on and check that water flows from the spray bar. Close the lid.
Every number this part goes by
- Retail name:
- 25004S
- Retail name:
- 4S
Sellers list any of these; they are the same part.
Will it fit your appliance?
Type your model number and we'll check it against the makers' lists.
Fits this Aqua One model
Aqua One1 model
Common questions
- What does the 25004S fit?
- The Aqua One Sponge 4s (25004S) for AquaStyle 850 fits the Aqua One AquaStyle 850.
- Where can I buy the 25004S in Australia?
- We track 1 Australian seller for the 25004S; the lowest listed price when we last checked was A$10.44 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
- How do I fit the 25004S?
- 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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