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A dollar six a filter, and half the box is washable

VANVE 0250728001, 32-piece set

A 32-piece set of carbon filters and pre-filter sponges for 2 L, 2.8 L and 4 L fountains, at $1.06 per filter.

VANVE set of sixteen cat fountain carbon filters with sixteen sponges

VANVE 0250728001, 32-piece set

A 32-piece set of carbon filters and pre-filter sponges for 2 L, 2.8 L and 4 L fountains, at $1.06 per filter.

Filters
16
Sponges
16
Price per filter
$1.06
Filter size
3.9 × 3.9 × 0.4 in
Sponge size
1.5 × 1.1 × 1.0 in
Layers
Non-woven fabric, activated carbon, ion exchange resin
Stated fitment
95 oz / 2.8 L, 67 oz / 2 L, 135 oz / 4 L
Change interval
Every 2 to 4 weeks
Preparation
Soak 2 minutes before use
Carbon weight
Not published
Amazon reference
B0FK62DZ77
EAN
0709226266077
  • The lowest price per filter on this shelf, at $1.06
  • Publishes both the filter and the sponge dimensions, so fitment can be checked with a ruler
  • Half the thirty-two pieces are sponges, which are washable and need not be replaced

Best for: A 2.8 L round fountain, stocked up for a year at the lowest unit price here

Check price on Amazon

Specifications

Filters
16
Sponges
16
Price per filter
$1.06
Filter size
3.9 × 3.9 × 0.4 in
Sponge size
1.5 × 1.1 × 1.0 in
Layers
Non-woven fabric, activated carbon, ion exchange resin
Stated fitment
95 oz / 2.8 L, 67 oz / 2 L, 135 oz / 4 L
Change interval
Every 2 to 4 weeks
Preparation
Soak 2 minutes before use
Carbon weight
Not published
Amazon reference
B0FK62DZ77
EAN
0709226266077

What you are getting

Sixteen carbon filters and sixteen pre-filter sponges — 32 pieces for $16.99, which is $1.06 a filter, the lowest on this shelf.

Half of what you paid for is washable

The sponges are the pre-filter: they keep hair and grit off the impeller, and they are rinsed, not replaced. Sixteen of the thirty-two pieces in this box are a part that a weekly rinse under the tap handles for nothing.

That is not a fault in this pack specifically — all nine sets on this shelf bundle the same way. It is worth knowing before the count on the front of the box is read as a measure of value.

The size that makes it generic

Filter 3.9 × 3.9 × 0.4 inch, sponge 1.5 × 1.1 × 1.0 inch. OPISICEN and Porens on this shelf publish exactly those two figures. Three brands, one part — which is why the per-filter price, from $1.06 to $1.33, is the only thing separating them.

It fits the common round fountains: 95 oz / 2.8 L, 67 oz / 2 L and 135 oz / 4 L.

Three layers, named

Non-woven fabric for hair, activated carbon for taste and odor, ion exchange resin for hardness. The maker asks for a two-minute soak before use and a change every two to four weeks.

What is not published

No carbon weight and no flow rate. Those are the two figures that would let one carbon pad be compared with another, and no listing on this shelf gives either.

Availability

Read on the day this page was built: $17 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

Do I need sixteen sponges?

No. The sponge is the pre-filter, and its job is to keep hair and grit off the impeller — it is washable. Rinsing it under the tap every week does more for pump life than any filter on this shelf. The carbon pad is the part that is genuinely spent after two to four weeks. Every set here bundles the two, so the piece count on the box is roughly double the number of parts you actually consume.

Will it fit my fountain?

The listing names three capacities — 95 oz / 2.8 L, 67 oz / 2 L and 135 oz / 4 L — and publishes the filter size, 3.9 × 3.9 × 0.4 inch. That second figure is the one to measure against, because the capacity printed on a fountain is not always the capacity it was sold under. Note that the OPISICEN set on this shelf, with the same dimensions, states it is not compatible with 84 oz / 2.5 L.

What do the three layers actually do?

Non-woven fabric catches hair and grit before they reach the carbon. Activated carbon handles taste and odor. Ion exchange resin softens the water by trading hard ions out. The first is mechanical and the last two are chemical, and the chemical ones are what expire — which is why the interval is two to four weeks whatever the box says about months.

Products this fits

More fountain filters

  • Veken F1 Series sixteen-pack of cat fountain filters with sponges and brushes

    Veken FIF3V126 F1 Series, 16 pack

    A sixteen-filter set with coconut shell carbon and a scale inhibitor for Veken F1 Series fountains, with four cleaning brushes.

    Filters
    16
    Sponges
    16
    Brushes
    4
    Price per filter
    $1.62
    Carbon
    Coconut shell activated carbon
    Extra layer
    Composite scale inhibitor
    Stated fitment
    Veken C1, C1 Classic, D1, D1 Pro
    Change interval
    Every 2 weeks
    Packaging
    Individually sealed
    Weight
    227 g (8 oz)
    Amazon reference
    B0C1FL8358
    EAN
    0850051133048
    • Names the carbon source — coconut shell — where the rest of this shelf says only "activated carbon"
    • The only filter here with a scale inhibitor, which matters in hard water
    • No carbon weight or capacity, so "lasts longer" cannot be checked

    Best for: A Veken C1 or D1 fountain, bought in the size that makes the price sensible

    Check price on Amazon
  • Veken F1 Series four-pack of cat water fountain replacement filters

    Veken FIF3V116 F1 Series, 4 pack

    A four-filter box of Veken F1 coconut shell carbon filters with sponges, at $3.00 a filter against $1.62 in the sixteen-pack.

    Filters
    4
    Sponges
    Included, count not stated
    Price per filter
    $3.00
    Carbon
    Coconut shell activated carbon
    Extra layer
    Composite scale inhibitor
    Stated fitment
    Veken C1, C1 Classic, D1, D1 Pro
    Duration at 2 weeks
    8 weeks
    Weight
    50 g (1.8 oz)
    Dimensions
    Not published
    Amazon reference
    B0BHNSFVX4
    EAN
    0850029083672
    • The same coconut shell carbon and scale inhibitor as the maker’s larger box
    • Eight weeks of cover, which suits a trial or a fountain on its way out
    • $3.00 a filter, the highest on this shelf and nearly double the maker’s own sixteen-pack

    Best for: Trying the Veken filter once, or covering the last two months of a fountain

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  • PetSafe Drinkwell activated carbon fountain filters

    PetSafe Drinkwell carbon filters

    Activated carbon filters that fit across most of the Drinkwell ceramic range — one part number instead of one per fountain.

    Type
    Activated carbon
    Fits
    PetSafe Drinkwell 1.8 L, 3.7 L and 7.5 L fountains, Sedona and Avalon
    Function
    PetSafe states it prevents odor and bacteria naturally
    Amazon reference
    DE B00ESZGJZS · US B005PPHP44 · GB B00ESZGJZS · FR B00ESZGJZS · IT B00ESZGJZS · ES B00ESZGJZS
    EAN
    0729849140882
    • One filter across most of the ceramic range — no part-number archaeology
    • Carbon rather than a plain sponge: it addresses taste as well as debris
    • Not listed on Amazon US at the time of checking

    Best for: Any Drinkwell ceramic owner, and particularly households running two fountains of different sizes.

    Check price on Amazon

Elsewhere in the cupboard

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    Composition
    80% tofu, 20% deodorized apple wood
    Weight
    10.8 kg (23.8 lb)
    Fragrance
    None — unscented, no pigment
    Odor control
    FUKUMARU credits the apple wood pellets rather than perfume
    Amazon reference
    B0CKPCTMPN (identical on 6 markets)
    EAN
    6973006316786
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    • Same tofu warranty caveat as every plant litter

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    Check price on Amazon
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    Composition
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    Weight
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    Clumping
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    Dust
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    Disposal
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    Amazon reference
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    EAN
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    Check price on Amazon
  • hiSpkNix pack of ten diamond-coated dog nail grinder replacement heads

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    Ten diamond-coated replacement heads for $9.98. The same five bullets as the nqnqvl pack, a sequential reference, and no diameter or grit.

    Heads in the pack
    10
    Price per head
    $1.00
    Abrasive
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    Grit
    Not published
    Head diameter
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    Stated fitment
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    Amazon reference
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    EAN
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    Best for: A smaller pack of the same unbranded head, when twenty is more than needed

    Check price on Amazon

All fountain filters