FitMatch

The Aqua One IFX 50 takes the Aqua One Sponge 188s (25188S) for IFX 50 as its filter media; Australian sellers list it from A$10.88 as of 29 October 2026. Fitment confirmed against the manufacturer's compatibility list.

Aqua One IFX 50

Your aquarium filter

Aquarium filter

Confirmed against Aqua One's list

Not yours? Change
25188S

Takes the 25188S

Filter media · check the code on your old filter.

Other Aqua One aquarium filters and their replacement media

The 25188S fits the IFX 50 only. These Aqua One models take a different filter media:

Genuine

$10.88

Aquarium Spare Parts · 29 Oct

Compatible

See seller

No compatible seller tracked yet

Genuine: made by Aqua One. Compatible: another brand.

Lowest price · $10.88

Aquarium Spare Parts. Every seller we track is listed below. Some links earn us a commission.

Open Aquarium Spare Parts

This aquarium filter also takes a carbon filter

Compare 1 seller

AUD, before delivery. Each price shows when it was checked.

Aquarium Spare PartsGenuine · checked 29 Oct$10.88Open
Open cheapest seller · $10.88

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 IFX 50

Watch the guide or follow the steps.

Aqua One IFX Internal Filters · Aqua One (official)
  1. 1Unplug the filter and any other equipment in the tank, as Aqua One advises and lift it out of the tank.
  2. 2Pull the filter casing off the motor and take out the sponge, and the carbon cartridge or pouch if your filter has one.
  3. 3Rinse the sponge gently in a bucket of water taken from the aquarium to flush out solid waste, then throw that water away. Aqua One says never to rinse it under the tap: chlorine kills the filter's bacteria.
  4. 4Put the sponge back, or fit a new one once the old one blocks up or breaks down.
  5. 5Put the media back in the casing, refit it to the motor, put the filter back in the tank and plug it in. Check that water flows.
Every number this part goes by
Retail name:
188S
Retail name:
25188S

Sellers list any of these; they are the same part.

About your IFX 50

Aqua One aquarium filter — IFX internal filter. Its filter media is the Sponge 188s (25188S) for IFX 50, part 25188S.

Other media the maker lists for this filter: Aqua One Sponge Phosphate 189s (25189S) for IFX 50. Phosphate-removing sponge set Aqua One lists for this filter; use it in place of a standard sponge if you need it.

Also in this aquarium filter: Aqua One Carbon Cartridge 188c (25188C) for IFX 50 (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 IFX 50?
The Aqua One IFX 50 takes the Aqua One Sponge 188s (25188S) for IFX 50.
Where can I buy the 25188S in Australia?
We track 1 Australian seller for the 25188S; the lowest listed price when we last checked was A$10.88 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
How do I fit the 25188S in an Aqua One IFX 50?
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.

Something looks wrong with the IFX 50 match? . Reports go to a person, not a bot.