The Fluval FX4 takes the Fluval Bio-Foam for FX4/FX5/FX6 Canister Filter, 3-Pack (part A228) as its filter media; Australian sellers list it from A$6.15 each as of 30 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your aquarium filter
Fluval FX4
Aquarium filter
Confirmed against Fluval's listConfirmed against Fluval's own compatibility list
Not yours? Change
Takes the A228 filter media
Bio-Foam for FX4/FX5/FX6 Canister Filter, 3-Pack · check the code printed on your old filter before ordering.
Your aquarium filter
Aquarium filter
Confirmed against Fluval's listConfirmed against Fluval's own compatibility list
Takes the A228
Filter media · check the code on your old filter.
Other Fluval aquarium filters that take the A228
GenuineGenuine Fluval
$11.63 each
3-pack $34.88
Aquarium Spare Parts · 30 OctLowest genuine · Aquarium Spare Parts · checked 30 Oct
CompatibleCompatible option
$6.15 each
6-pack $36.88
Aquarium Spare Parts · 30 OctAquarium Spare Parts · checked 30 Oct
Check sellerCheck seller details
Genuine: made by Fluval. Compatible: another brand.Genuine is made by Fluval. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $6.15 each · 6-pack $36.88
Aquarium Spare Parts. Compare with genuine 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
- Fluval Carbon Foam for FX2/FX4/FX5/FX6 Canister Filter, 2-PackOpen Aquarium Spare Parts$6.15 each · 6-pack $36.88
The carbon filter. Separate from the filter media. Reduces odours, discolouration and dissolved impurities (carbon). Replace every month.
- Fluval Quick-Clear for FX2/FX4/FX5/FX6 Canister Filter, 3-PackOpen Aquarium Spare Parts$3.81 each · 6-pack $22.88
The fine pad. Separate from the filter media. Reduces fine particles that cloud the water (polishing pad).
- Fluval Max-Clean for FX2/FX4/FX5/FX6 Canister Filter, 3-PackOpen Aquarium Spare Parts$3.81 each · 6-pack $22.88
The fine pad. Max-Clean polishing pads Fluval lists for this filter (in place of Quick-Clear). Separate from the filter media. Reduces fine particles (polishing pad).
Compare 3 listings from 2 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
2 sellers
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 as the filter's manual says; Fluval gives no set interval for this foam.
How to change the filter media in your Fluval FX4
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Unplug the filter and close the hose valves before you disconnect it.
- 2Open the filter and lift the media baskets out of the canister.
- 3Rinse foam in water from the aquarium; rinse BIOMAX in aquarium water only: Fluval says never to rinse it with tap water.
- 4Fit the new Bio-Foam where the old media sat. Fluval says not to replace all filter media at the same time.
- 5Put the baskets back in the same order, close the filter, then prime and restart it as its manual describes.
Every number this part goes by
- Retail name:
- A-228
- Retail name:
- A228
Sellers list any of these; they are the same part.
About your Fluval FX4
Fluval aquarium filter — FX Series canister filter. Its filter media is the Bio-Foam for FX4/FX5/FX6 Canister Filter, 3-Pack, part A228.
Other media the maker lists for this filter: Fluval Bio-Foam+ for FX2/FX4/FX5/FX6 Canister Filter, 2-Pack. Bio-Foam+: the fine foam Fluval lists for this filter.
Also in this aquarium filter:
- Fluval Carbon Foam for FX2/FX4/FX5/FX6 Canister Filter, 2-Pack (every month), Fluval Quick-Clear for FX2/FX4/FX5/FX6 Canister Filter, 3-Pack.
- Fluval Max-Clean for FX2/FX4/FX5/FX6 Canister Filter, 3-Pack. Max-Clean polishing pads Fluval lists for this filter (in place of Quick-Clear).
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 Fluval FX4?
- The Fluval FX4 takes the Fluval Bio-Foam for FX4/FX5/FX6 Canister Filter, 3-Pack (part A228). Compatible filters made to the same specification also fit.
- Where can I buy the A228 in Australia?
- We track 2 Australian sellers for the A228; the lowest listed price when we last checked was A$6.15 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
- How do I fit the A228 in a Fluval FX4?
- 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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