The Aqua One ClearView 400 takes the Aqua One Carbon Cartridge 56c (25056C) for ClearView 400 and Horizon 130 as its carbon filter; replace it every 2 months; Australian sellers list it from A$7.94 each as of 29 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your aquarium filter
Aqua One ClearView 400
Aquarium filter
Confirmed against Aqua One's listConfirmed against Aqua One's own compatibility list
Not yours? ChangeSave it · remind me every 2 months
Takes the 25056C carbon filter
Carbon Cartridge 56c (25056C) for ClearView 400 and Horizon 130 · replace every 2 months · 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 25056C
Carbon filter · every 2 months · check the code on your old filter.
Other Aqua One aquarium filters that take the 25056C
GenuineGenuine Aqua One
$7.94 each
2-pack $15.88
Aquarium Spare Parts · 29 OctLowest genuine · Aquarium Spare Parts · checked 29 Oct
CompatibleCompatible option
See seller
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 · $7.94 each · 2-pack $15.88
Aquarium Spare Parts. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
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AUD, before delivery. Each price shows when it was checked.
Genuine Aqua One
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Not due yet?
Get a nudge when your carbon filter is due — it's every 2 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the carbon filter in your Aqua One ClearView 400
Watch the guide or follow the steps.
- 1Unplug the filter at the power supply and lift it off the back of the aquarium.
- 2Remove the dust cover (lid), drain the water left in the filter body over a sink or bucket, and take out the carbon cartridge and the sponge.
- 3Rinse the sponge gently in a bucket of aquarium water, only to remove solid waste: Aqua One says never to rinse it with tap water. Shake the carbon cartridge in the same water to flush out waste.
- 4Fit a new carbon cartridge every 6–8 weeks. On the ClearView 100 and 280 it slides into the furthest grooves with the wool facing the back of the filter; the sponge sits between it and the front.
- 5Hang the filter back on the aquarium, fill the filter body with aquarium water until it overflows back into the tank, replace the dust cover and turn it on.
Every number this part goes by
- Retail name:
- 25056C
- Retail name:
- 56C
Sellers list any of these; they are the same part.
About your Aqua One ClearView 400
Aqua One aquarium filter — ClearView hang-on filter. Its carbon filter is the Carbon Cartridge 56c (25056C) for ClearView 400 and Horizon 130, part 25056C, changed 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 these 2 Aqua One models
Aqua One2 models
Common questions
- Which carbon filter fits the Aqua One ClearView 400?
- The Aqua One ClearView 400 takes the Aqua One Carbon Cartridge 56c (25056C) for ClearView 400 and Horizon 130.
- How often should I replace the carbon filter in my Aqua One ClearView 400?
- Every 2 months. It works less well as the filter fills up, so it's worth doing on time.
- Where can I buy the 25056C in Australia?
- We track 2 Australian sellers for the 25056C; the lowest listed price when we last checked was A$7.94 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
- How do I fit the 25056C in an Aqua One ClearView 400?
- 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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