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 Media Set 401p (25401P) for Aquis 550 Series II and Aquis 750 Series II

25401P

Fits 2 models

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GenuineGenuine Aqua One

$24.88

Aquarium Spare Parts · 29 OctLowest genuine · Aquarium Spare Parts · checked 29 Oct

CompatibleCompatible option

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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 · $24.88

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Genuine Aqua One

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How long it lasts

Replace it piece by piece: Aqua One says to replace the wool regularly and the sponges once they clog or lose their shape.

How to change the 25401P aquarium filter media

Watch the guide or follow the steps.

Aqua One Aquis Series 2 Canister Filter · 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.
4Rinse the sponges in the bucket of aquarium water and fit the new pads from the set where the old ones sat: Aqua One says to replace the wool regularly and the sponges once they clog.
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 by25401P · 401P

Retail name:: 25401P
Retail name:: 401P

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 2 Aqua One modelsAquis 550 Series II, Aquis 750 Series II

Aqua One2 models

Common questionsWhat does the 25401P fit? · Where can I buy the 25401P in Australia? · How do I fit the 25401P?

What does the 25401P fit?: The Aqua One Media Set 401p (25401P) for Aquis 550 Series II and Aquis 750 Series II fits the Aqua One Aquis 550 Series II and Aquis 750 Series II.
Where can I buy the 25401P in Australia?: We track 1 Australian seller for the 25401P; the lowest listed price when we last checked was A$24.88 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
How do I fit the 25401P?: 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 25401P match? . Reports go to a person, not a bot.