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

Aqua One Wool 81w (25081W) for Nautilus 600, Nautilus 800 and Brilliance 80

25081W

Fits 3 models

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GenuineGenuine Aqua One

$6.94 each

2-pack $13.88

Aquarium Spare Parts · 30 OctLowest genuine · Aquarium Spare Parts · checked 30 Oct

CompatibleCompatible option

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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 · $6.94 each · 2-pack $13.88

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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 Aqua One

1 seller

Aquarium Spare PartsGenuine · checked 30 OctGenuine part · Lowest genuinechecked 30 Oct$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 regularly, Aqua One says, or once it starts to break down and no longer cleans up.

How to change the 25081W aquarium filter media

Watch the guide or follow the steps.

Aqua One Nautilus Canister Filters · Aqua One (official)

1Turn the canister filter off at the power point and unplug it. Close the taps or flow valve and disconnect the tap connector from the head unit (Nautilus: lift the locking lever).
2Fill a bucket with water from your aquarium. Release the clips, lift off the head unit and take the media baskets out of the canister.
3Take out the sponges and the white wool. Dunk the baskets of biological media a few times in the bucket of aquarium water: Aqua One says this keeps the chlorine in tap water from killing the good bacteria on it.
4Fit a new wool pad: Aqua One says to replace the wool regularly, or when it starts to break down and can no longer be cleaned properly.
5Put the media back in the same baskets and order, refit the baskets and head unit, then prime and restart the filter as its manual describes.

Every number this part goes by25081W · 81W

Retail name:: 25081W
Retail name:: 81W

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 3 Aqua One modelsBrilliance 80, Nautilus 600, Nautilus 800

Aqua One3 models

Common questionsWhat does the 25081W fit? · Where can I buy the 25081W in Australia? · How do I fit the 25081W?

What does the 25081W fit?: The Aqua One Wool 81w (25081W) for Nautilus 600, Nautilus 800 and Brilliance 80 fits the Aqua One Brilliance 80, Nautilus 600 and Nautilus 800.
Where can I buy the 25081W in Australia?: We track 1 Australian seller for the 25081W; 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 25081W?: 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 25081W match? . Reports go to a person, not a bot.