Buy links on this page go through our /go/ redirects to the manufacturer or retailer. We earn nothing from them today; that may change. Disclosure.
Quick answer
PetSafe, Catit and Veken each sell filters made for their own fountains. Catit says its Flower fountains are only for use with certified Catit filters, and Veken says its filters are made to fit Veken fountains. So start with the brand on your fountain, then pick the size for your model.
Genuine filters for each fountain:
Catit Flower Filters (#43745) Catit PIXI Filters (#43721) PetSafe Carbon (PAC00-13906) PetSafe Foam (PAC00-13711)Two designs: a separate foam and carbon pair, or one pad
| Filter | Part numbers | Size (maker's figure) | What the maker says it does | Change every |
|---|---|---|---|---|
| PetSafe Drinkwell carbon | PAC00-13906 (4 pack) | 1.9 x 1.9 x 1.3 in | Coconut shell carbon | 2 to 4 weeks |
| PetSafe Drinkwell foam | PAC00-13711 (2 pack) | 1.2 x 2.8 x 3.0 in | Catches hair and debris, helps keep the pump clean | 1 to 2 months |
| Catit Flower Triple Action | #43745 (2), #43746 (5), #43748 (12) | 14.5 x 14.5 x 1.7 cm (5.7 x 5.7 x 0.6 in) | Cotton mesh, activated carbon, ion exchange resin | 30 days |
| Catit PIXI | #43721 (3), #43722 (6), #43723 (12) | 8.5 x 8.5 x 0.9 cm (3.3 x 3.3 x 0.3 in) | Same three layers | 30 days |
| Veken, 67/95/135 oz fountains | 4, 8, 12 or 16 packs | 3.9 x 3.9 x 0.4 in; sponge 1.5 x 1.1 x 1.0 in | Silver, coconut shell carbon, scale inhibitor | Not stated on the filter page |
| Veken, 85 oz fountain | Separate 85 oz option | 4.9 x 4.9 x 0.4 in | Same media description | Not stated on the filter page |
Which PetSafe fountains each part fits
- Carbon PAC00-13906: Drinkwell ½ Gallon, 1 Gallon and 2 Gallon (including Oasys versions), Butterfly, Avalon, Pagoda, Seascape, Sedona, Seaside and Creekside.
- Foam PAC00-13711: the same list, plus the Stainless Multi-Pet.
If your Drinkwell model is not on either list, check the model's own page on PetSafe before ordering.
Catit Flower vs PIXI
Catit lists the Triple Action pad for every full-size Catit Flower Fountain: the original, the stainless steel and the LED version. The PIXI pad fits every Catit PIXI fountain: Smart, Stainless Steel UV-C, standard and stainless top. At 14.5 cm vs 8.5 cm across, they are clearly different sizes.
Catit says the ion exchange resin filters excess calcium and magnesium, and that in large amounts these minerals can build up in the lower urinary tract and may lead to urinary tract disease. That is Catit's own product claim; ask your vet about your cat's urinary health.
Veken: pick by ounce capacity
Veken's filter page sorts sizes by fountain capacity: a 3.9 inch filter for its 67, 95 and 135 oz fountains, and a 4.9 inch filter for its 85 oz fountain. (The page's size menu labels that option 84 oz while the specs say 85 oz.) Check the capacity on your fountain or its box before ordering.
How we work: sizes, part numbers and fit lists come from each maker's product page, listed below. We have not tested these filters, and we don't cover third-party "compatible" pads here.
Questions people ask
Do Catit Flower filters fit a Catit PIXI fountain?
Catit lists them for different fountains. The Flower Triple Action pad (#43745) is 14.5 x 14.5 cm and fits full-size Flower fountains; the PIXI pad (#43721) is 8.5 x 8.5 cm and fits PIXI fountains.
Which PetSafe fountains take the PAC00-13906 carbon filter?
PetSafe lists the Drinkwell ½ Gallon, 1 Gallon and 2 Gallon (including Oasys versions), Butterfly, Avalon, Pagoda, Seascape, Sedona, Seaside and Creekside. If your model isn't listed, check its page on PetSafe.
Which Veken filter do I need?
Veken's filter page lists a 3.9 x 3.9 inch filter for its 67, 95 and 135 oz fountains and a 4.9 x 4.9 inch filter for its 85 oz fountain. Check the capacity on your fountain or its box.
Sources
Last checked Oct 23, 2026. Fountain tray shapes and pump models change by revision; check the maker's part number on your fountain base or manual before ordering.
- PetSafe: Drinkwell replacement carbon filters, 4 pack (PAC00-13906)
- PetSafe: Drinkwell foam replacement filters, 2 pack (PAC00-13711)
- PetSafe Support: How to replace the carbon and foam filters (Drinkwell ½, 1, 2 gallon)
- Catit: Triple Action fountain filters for Flower fountains (#43745 / #43746 / #43748)
- Catit: PIXI fountain filters (#43721 / #43722 / #43723)
- Catit: Flower Fountain LED manual (PDF)
- Veken: Pet water fountain replacement filters (sizes by fountain capacity)
