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.

Aquarium filter media

Fluval Bio-Foam+ for 306/406, 307/407 Canister Filter, 2-Pack

A237

Fits 4 models

Wrong part, or your model missing? Tell us. A person checks every report.

GenuineGenuine Fluval

$6.94 each

2-pack $13.88

Aquarium Spare Parts · 8 NovLowest genuine · Aquarium Spare Parts · checked 8 Nov

CompatibleCompatible option

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No compatible seller tracked yetNo compatible seller tracked yet

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 price · $6.94 each · 2-pack $13.88

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.

Open Aquarium Spare Parts · $6.94 each · 2-pack $13.88

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

Genuine Fluval

1 seller

Aquarium Spare PartsGenuine · checked 8 NovGenuine part · Lowest genuinechecked 8 Nov$6.94 each2-pack $13.88OpenGo to seller

Open cheapest seller · $6.94 each · 2-pack $13.88

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 as the filter's manual says; Fluval gives no set interval for this part.

How to change the A237 aquarium filter media

Watch the guide or follow the steps.

Fluval 07 Canister Filter Series | General Maintenance · Fluval Aquatics (official)

1Unplug the filter and close the hose valves (the AquaStop valve on 06 and 07 series filters) 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+ (fine 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 byA-237 · A237

Retail name:: A-237
Retail name:: A237

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.

Your appliance model

Fits these 4 Fluval models306, 307, 406, 407

Fluval4 models

Bio-Foam+: the fine foam Fluval lists for this filter.

Common questionsWhat does the A237 fit? · Where can I buy the A237 in Australia? · How do I fit the A237?

What does the A237 fit?: The Fluval Bio-Foam+ for 306/406, 307/407 Canister Filter, 2-Pack (part A237) fits 4 Fluval models, including the 306, 307 and 406. Every one is listed on this page.
Where can I buy the A237 in Australia?: We track 1 Australian seller for the A237; the lowest listed price when we last checked was A$6.94 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
How do I fit the A237?: 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 A237 match? . Reports go to a person, not a bot.