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Small SpaceCat Gear

Measure, check, plan

Cat Fountain Filter Replacement Calculator

Match your fountain, list the next filter dates and see whether your spare filters cover the plan.

Identify, clean, then plan

Find the right filter, see your next replacement dates, and work out whether your cupboard already holds enough.

1. Check your fountain

2. Build your calendar

3. Count what you already have

Cost is your input, not a live retailer price.

View my result

Clean and check before buying

  1. Unplug the fountain. Stop using damaged cords, adapters or housings.
  2. Follow the manual to remove debris from the intake, tube and accessible impeller. Do not open sealed electrical parts.
  3. Refill to the manual’s working level, reassemble correctly, and test with dry hands and a safe cord route.
  4. If flow returns, keep the working pump. Filter replacement does not clean biofilm.
Follow the pump troubleshooting guide

Do not buy yet. Identify the model and verify the interval. Illustration only: a 30-day schedule has events on days 30, 60 and 90; this is not your supply recommendation.

Identify the model before the part

Full-size Flower and Mini Flower filters are not interchangeable. Read the model label before selecting a pack; matching shape or brand is insufficient. No pump fit is established here because connector and revision evidence is missing.

Filter models and pack counts from Catit
Exact modelFilter pack SKUExcluded model
Catit Flower Fountain #4374243745 (2), 43746 (5), 43748 (12)Mini Flower 43735
Catit Mini Flower Fountain #4373544005 (3)Flower 43742

Worked calendar: with a fresh filter installed on October 1, a confirmed 30-day interval and a 90-day inclusive horizon, changes fall on October 31, November 30 and December 30. Two unused filters leave one short; a two-pack covers it with one left. Cleaning remains a separate task.

Where these details come from
Catit Flower Fountain

Section: Technical specifications; filtration. Scope: 43742; North America and Europe identified separately; unspecified revisions not inferred. Source checked: 2026-09-18. Source revision date: not stated. Evidence: manufacturer-stated.

  • 43742 footprint 21 × 21 cm; reservoir capacity 3 L, not a minimum working level.
  • Uses Triple Action Fountain Filter. Plastic body per manufacturer.
Catit Mini Flower Fountain

Section: Technical specifications; Mini Flower Fountain Filter. Scope: 43735. Source checked: 2026-09-18. Source revision date: not stated. Evidence: manufacturer-stated.

  • 43735 footprint 18 × 18 cm; reservoir capacity 1.5 L.
  • Requires mini-sized filter; full-size Flower filter fit is not inferred.
Catit Triple Action Fountain Filters

Section: Specifications; Tips for use. Scope: Flower Fountain; packs 43745 / 43746 / 43748. Source checked: 2026-09-18. Source revision date: not stated. Evidence: manufacturer-stated.

  • Packs of 2, 5 and 12 respectively.
  • Manufacturer states replacement every 30 days. Check the supplied manual if its guidance differs.
Catit Mini Fountain Filters

Section: Specificaties; Tips voor gebruik. Scope: Mini Flower Fountain; 44005 3-pack; regional retailer availability unverified. Source checked: 2026-09-18. Source revision date: not stated. Evidence: manufacturer-stated.

  • 44005 is a 3-pack for the Mini Flower Fountain.
  • Manufacturer specifies 30-day replacement.

Keep going

When should you replace a fountain filter?How to clean a slimy cat fountainCat fountain not pumping? Start here.

Sources and Official References