The Aqua One HFX 100 takes the Aqua One Sponge 196s (25196S) as its filter media; Australian sellers list it from A$3.44 each as of 7 November 2026. Fitment confirmed against the manufacturer's compatibility list.
Your aquarium filter
Aqua One HFX 100
Aquarium filter
Confirmed against Aqua One's listConfirmed against Aqua One's own compatibility list
Not yours? Change
Takes the 25196S filter media
Sponge 196s (25196S) · 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 25196S
Filter media · check the code on your old filter.
Other Aqua One aquarium filters that take the 25196S
GenuineGenuine Aqua One
$3.44 each
2-pack $6.88
Aquarium Spare Parts · 7 NovLowest genuine · Aquarium Spare Parts · checked 7 Nov
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 · $3.44 each · 2-pack $6.88
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.
Other parts this aquarium filter takes
- Aqua One Ceramic Cartridge 197c (25197C)Open Aquarium Spare Parts$3.44 each · 2-pack $6.88
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 196c (25196C)Open Aquarium Spare Parts$4.94 each · 2-pack $9.88
The carbon filter. Separate from the filter media. Reduces dissolved waste, odours and discolouration (activated carbon). Replace every 2 months. Out of stock when we checked.
Compare 2 sellers - Aqua One Intake Sponge 197s (25197S)Open Aquarium Spare Parts$7.88
The intake sponge. Separate from the filter media. Reduces debris at the filter intake.
Compare 1 seller
AUD, before delivery. Each price shows when it was checked.
Opens Aquarium Spare Parts in a new tab. Their page is the source of truth for price, delivery and returns.
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 HFX 100
Watch the guide or follow the steps.
- 1Unplug the filter at the power supply and take it to a sink with a bucket of water from your aquarium.
- 2Remove the lid and lift the carbon cartridge out, letting the water drain. Slide the sponge out of the carbon cartridge and rinse it gently in the tank water by squeezing.
- 3Rinse the carbon cartridge by shaking it under the water in the bucket. Aqua One says the ceramic cartridge (HFX 100, 150 and 200) is not taken out at routine cleans or cleaned with tap water.
- 4Slide the sponge back into the carbon cartridge, or a new one once the old one blocks up or breaks down.
- 5Tip the dirty water out of the filter body, hang the filter back in place and refill it with aquarium water. Refit the lid, plug it in and check that water flows.
Every number this part goes by
- Retail name:
- 196S
- Retail name:
- 25196S
Sellers list any of these; they are the same part.
About your Aqua One HFX 100
Aqua One aquarium filter — HFX hang-on filter. Its filter media is the Sponge 196s (25196S), part 25196S.
Also in this aquarium filter: Aqua One Ceramic Cartridge 197c (25197C), Aqua One Carbon Cartridge 196c (25196C) (every 2 months), Aqua One Intake Sponge 197s (25197S).
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.
Common questions
- Which filter media fits the Aqua One HFX 100?
- The Aqua One HFX 100 takes the Aqua One Sponge 196s (25196S).
- Where can I buy the 25196S in Australia?
- We track 1 Australian seller for the 25196S; the lowest listed price when we last checked was A$3.44 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
- How do I fit the 25196S in an Aqua One HFX 100?
- 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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