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The 2.5 liter set, and it says it is not for Catit

Cirfifth 001, 12 pack

Twelve individually sealed carbon filters for 84 oz / 2.5 L round fountains, explicitly not for Catit, with a 12-month warranty.

Cirfifth twelve-pack of cat water fountain replacement carbon filters

Cirfifth 001, 12 pack

Twelve individually sealed carbon filters for 84 oz / 2.5 L round fountains, explicitly not for Catit, with a 12-month warranty.

Filters
12
Sponges
None — filters only
Price per filter
$1.17
Stated fitment
84 oz / 2.5 L round fountains
Stated incompatibility
Catit brand fountains
Layers
Cotton, activated carbon, ion exchange resin
Packaging
Individually sealed
Warranty
12 months
Change interval
Every 2 to 4 weeks
Filter dimensions
Not published
Amazon reference
B08Y734789
EAN
0721223137631
  • The only set on this shelf for the 84 oz / 2.5 L fountain
  • Filters only, with no sponges padding the count
  • No filter dimensions published, so fitment rests on the capacity alone

Best for: An 84 oz / 2.5 L round fountain that is not a Catit

Check price on Amazon

Specifications

Filters
12
Sponges
None — filters only
Price per filter
$1.17
Stated fitment
84 oz / 2.5 L round fountains
Stated incompatibility
Catit brand fountains
Layers
Cotton, activated carbon, ion exchange resin
Packaging
Individually sealed
Warranty
12 months
Change interval
Every 2 to 4 weeks
Filter dimensions
Not published
Amazon reference
B08Y734789
EAN
0721223137631

What you are getting

Twelve carbon filters for the 84 oz / 2.5 L round fountain. $13.99 — $1.17 a filter, and the only set on this shelf for that capacity.

The one capacity the others rule out

OPISICEN, on this same shelf, writes: “ONLY Compatible with 95 oz / 2.8 L & 67 oz / 2 L & 135 oz / 4 L. Not compatible with 84 oz / 2.5 L.”

This is the set for the fountain that sentence excludes. Two listings, the same number, opposite meanings — and between them they make the 2.5 L question answerable, which no single page on this shelf manages alone.

And it names a brand it will not fit

“Not compatible with Catit brand fountain.” The Catit PIXI in this site’s own fountain reviews is a 2.5 liter machine, so without that line a buyer could reasonably have ordered this for it.

Catit filters are sold separately and already published on this shelf.

Twelve filters, and no sponges

This is the only set here that is filters only. Where VANVE sells 16 filters with 16 sponges and OPISICEN 34 pieces in total, this is twelve carbon pads and nothing else.

Given that the sponge is washable, that is not a loss. It makes the per-filter price honest: $1.17 buys a filter, not a filter and a thing you already own.

Three layers and a warranty

Cotton, activated carbon and ion exchange resin, individually sealed, with a stated 12-month warranty — the only warranty on this shelf. Soak two minutes, rinse, change every two to four weeks.

What is not published

No filter dimensions. The capacity is named and the brand exclusion is named, but there is no measurement to check against a fountain whose model is uncertain.

Availability

Read on the day this page was built: $14 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.

The questions owners ask

How do I know my fountain is 84 oz?

By its stated capacity — 84 US fluid ounces is 2.5 liters. It matters more than usual here because the two numbers split this shelf: the OPISICEN set states it is not compatible with 84 oz / 2.5 L, and this one is for nothing else. If the fountain is 95 oz / 2.8 L, this is the wrong pack, and vice versa.

Why not for Catit?

The listing says so without explaining: "Not compatible with Catit brand fountain". Catit uses its own filter shape, and this site publishes the Catit Flower and PIXI filters separately on this shelf. The PIXI is a 2.5 liter machine, so the exclusion is doing real work — without it, the capacity alone would have pointed a buyer straight at the wrong pack.

No sponges — is that a problem?

No, and arguably it is the honest way to sell them. The sponge is a washable pre-filter: rinsing it weekly does more for pump life than replacing it. Every other set on this shelf bundles sponges with carbon, which doubles the piece count on the box without doubling what you consume. Twelve filters here are twelve filters.

More fountain filters

  • DOOOB twenty-four pack of cat fountain carbon and sponge filters

    DOOOB 5006-1, 24 pack

    A 24-piece filter and sponge set for stainless steel fountains, with the shortest change interval on this shelf and no published dimensions.

    Pieces
    24, carbon filters and sponge filters
    Price per filter
    $1.50 on a 12-and-12 split
    Stated fitment
    "Most stainless steel cat water fountains"
    Layers
    Non-woven, activated carbon, ion exchange resin
    Change interval
    Every 1 to 2 weeks
    Preparation
    Soak 5 minutes in a separate bowl, rinse 30 seconds
    Filter dimensions
    Not published
    Capacity
    Not published
    Amazon reference
    B0BQM9JH5B
    EAN
    6975681804480
    • The only set here that names a fountain material rather than a capacity
    • The soak instruction names a separate bowl, which keeps carbon dust out of the pump
    • No dimensions of any kind, so the compatibility it asks you to check cannot be checked on the page

    Best for: A stainless fountain whose filter size is already known from the old pack

    Check price on Amazon
  • OPISICEN set of cat fountain filters, sponges and two cleaning brushes

    OPISICEN OP-00003, 34-piece set

    A 34-piece set for 2 L, 2.8 L and 4 L fountains, stating plainly that it does not fit 84 oz / 2.5 L, with two pump brushes included.

    Filters
    16
    Sponges
    16
    Brushes
    2, in two sizes
    Price per filter
    $1.25
    Filter size
    3.9 × 3.9 × 0.4 in
    Sponge size
    1.5 × 1.1 × 1.0 in
    Stated fitment
    95 oz / 2.8 L, 67 oz / 2 L, 135 oz / 4 L
    Stated incompatibility
    84 oz / 2.5 L
    Layers
    Activated carbon, ion exchange resin, non-woven fabric
    Change interval
    Every 2 to 4 weeks
    Amazon reference
    B0CFJ2D6JW
    EAN
    0602318848932
    • The clearest capacity exclusion on this shelf — it names the size it will not fit
    • Two brushes, one of them narrow enough for the pump channel
    • Nineteen cents a filter dearer than the identically sized VANVE set

    Best for: A 2.8 L fountain whose pump channel has never been brushed out

    Check price on Amazon
  • PETLIBRO replacement filter and sponge set for Dockstream cat fountains

    PETLIBRO PL-FF005-02W, 8 count

    A four-month set of eight filters and eight sponges for PETLIBRO Dockstream fountains, with four named filtration stages.

    Filters
    8
    Sponges
    8
    Price per filter
    $2.30
    Stated fitment
    PLWF106, PLWF116, PLWF105, PLWF115, PLWF005, PLWF305
    Stages
    Activated carbon, ion exchange resin, non-woven fabric, pump sponge
    Change interval
    Every 2 weeks
    Set duration
    4 months
    Preparation
    Soak 5 minutes, rinse 30 seconds
    Packaging
    Filters and sponges packed individually
    Filter dimensions
    Not published
    Amazon reference
    B0B7J16VGK
    EAN
    0752859356622
    • Six model numbers named, the most precise fitment statement on this shelf
    • Four filtration stages described in order, including what the pump sponge contributes
    • $2.30 a filter, more than double the generic sets on this shelf

    Best for: A PETLIBRO Dockstream fountain, run on the maker’s own two-week schedule

    Check price on Amazon

Elsewhere in the cupboard

  • PETLIBRO replacement corded pump for the PLWF002 cat water fountain

    PETLIBRO PLFF012, for PLWF002

    A corded replacement pump for the PETLIBRO PLWF002 fountain, supplied with its power cord.

    Reference
    PLFF012
    Stated fitment
    PETLIBRO PLWF002
    In the box
    One pump with power cord
    Power
    Corded
    Noise claim
    None given
    Flow rate
    Not published
    Voltage
    Not published
    Cleaning
    With the brush supplied with the fountain
    Weight
    91 g (3.2 oz)
    Amazon reference
    B096FQVQ5F
    EAN
    0782943477148
    • A single model number, which is the easiest fitment claim on this shelf to verify
    • Ships with its power cord rather than expecting the old one
    • One fountain only — nothing else in the PETLIBRO range

    Best for: A PETLIBRO PLWF002 whose pump has stopped

    Check price on Amazon
  • PETLIBRO wireless replacement pump for Dockstream cat water fountains

    PETLIBRO PLFF015 wireless

    A wireless replacement pump for three PETLIBRO fountains, which stops automatically when the water level falls too low.

    Reference
    PLFF015
    Power
    Wireless — no cable in the water
    Stated fitment
    PETLIBRO PLWF005, PLWF115, PLWF105
    Dry-run protection
    Stops automatically below a safe water level
    Noise claim
    23 dB, stated also at low water level
    Flow rate
    Not published
    Run time
    Not published
    Weight
    90 g (3.2 oz)
    Amazon reference
    B0FRF6BLJS
    EAN
    6976166725702
    • Stops itself when the water runs low, which is how fountain pumps usually die
    • No cable in the water, so the bowl lifts off and gets cleaned more often
    • No flow rate, and no run time or charging detail for a wireless unit

    Best for: A PETLIBRO Dockstream fountain that is left unattended for days at a time

    Check price on Amazon
  • PetSafe Drinkwell OEM submersible replacement fountain pump with adaptor

    PetSafe PAC00-13206

    The OEM submersible replacement pump for eleven Drinkwell fountains, supplied with its power adaptor.

    Reference
    PAC00-13206
    Type
    Submersible, OEM
    In the box
    Pump and power adaptor
    Stated fitment
    Avalon, Pagoda, Sedona, Seascape, Stainless Multi-Pet, Plastic 360, Zen, Multi-Tier, Seaside Stainless, Creekside Ceramic
    Maintenance
    Quick disassembly; clean every 2 weeks
    Flow rate
    Not published
    Voltage
    Not published
    Noise claim
    None given
    Amazon reference
    B076ZCK7QT
    EAN
    0729849132061
    • Eleven fountains named, the longest fitment list on this shelf
    • The power adaptor is included, where five pumps here ship without one
    • The most expensive pump on this shelf at $20.99, nearly three times the Baofum generic

    Best for: A Drinkwell fountain, where the OEM part removes the fitment question entirely

    Check price on Amazon

All fountain filters