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 Phosphate Sponge Set 83s (25083S) for Nautilus 600 and Nautilus 800

25083S

Fits 2 models

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GenuineGenuine Aqua One

$8.44 each

2-pack $16.88

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 · $8.44 each · 2-pack $16.88

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 · $8.44 each · 2-pack $16.88

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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$8.44 each2-pack $16.88OpenGo to seller

Open cheapest seller · $8.44 each · 2-pack $16.88

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; Aqua One gives no set interval for this part.

How to change the 25083S 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.
4Rinse the standard sponges in the bucket of aquarium water and fit the phosphate sponge where the old one sat.
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 by25083S · 83S

Retail name:: 25083S
Retail name:: 83S

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 modelsNautilus 600, Nautilus 800

Aqua One2 models

Phosphate-removing sponge set Aqua One lists for this filter; use it in place of a standard sponge if you need it.

Common questionsWhat does the 25083S fit? · Where can I buy the 25083S in Australia? · How do I fit the 25083S?

What does the 25083S fit?: The Aqua One Phosphate Sponge Set 83s (25083S) for Nautilus 600 and Nautilus 800 fits the Aqua One Nautilus 600 and Nautilus 800.
Where can I buy the 25083S in Australia?: We track 1 Australian seller for the 25083S; the lowest listed price when we last checked was A$8.44 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
How do I fit the 25083S?: 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 25083S match? . Reports go to a person, not a bot.