Quel filtre est compatible avec quelle fontaine à eau ?
Your pet fountain only works properly with the right filter. But which filter is right for your model? This short guide shows you at a glance which filter fits the HydroBuddy, the FlowMate Pro and the AquaPaw – and how often you should replace it for fresh, healthy water.
📌 In brief
- Each pet fountain has its own suitable filter.
- HydroBuddy 4L → Filter for HydroBuddy.
- FlowMate Pro 4L → FlowMate Filter (12-pack).
- AquaPaw 2.5L → Filter for AquaPaw.
- Replace the filter on average every 2 to 4 weeks.
Why does each pet fountain have a specific filter?
Because the pump design, water reservoir, and shape vary by model. A filter that doesn't fit exactly won't seal properly, will filter less efficiently, and can even obstruct water flow. Always choose the filter designed for your model.
Which filter belongs to which SmartPaw fountain?
Use this table to find the right filter immediately:
| Pet Fountain | Associated Filter | Good to know |
|---|---|---|
| HydroBuddy 4L (Stainless steel, app) | Filter for HydroBuddy | For the stainless steel fountain with app control |
| FlowMate Pro 4L (Stainless steel) | FlowMate Filter (12-pack) | Economical 12-pack – lasts a long time |
| AquaPaw 2.5L (Wireless) | Filter for AquaPaw | For the wireless battery-powered model |
If you still have an older WF117B model? Then you use the filter for the WF117B. All parts can be found clearly in our collection of accessories and spare parts.
Filter for HydroBuddy
Original replacement filter for your HydroBuddy 4L. Keeps water clear and protects the pump.
View product →
FlowMate Filter (12-pack)
Economical set of 12 filters for the FlowMate Pro – keeps you going for a year.
View product →
Filter for AquaPaw
Matching replacement filter for the wireless AquaPaw 2.5L. Fresh water, wherever you place the fountain.
View product →How often should you replace the filter?
On average every 2 to 4 weeks, depending on the number of pets and water quality. With multiple cats or hard water, you replace it more often. Read the details in our article how often you should replace your pet fountain filter.
💡 Tip: Keep a few spare filters in stock. This way, you can replace it immediately when the water smells less fresh or the flow rate decreases.
What exactly does the filter do?
It filters hair, food residue, and dirt from the water, reduces limescale, and keeps the water fresh. This way, your pet drinks more, and you protect the pump from clogging and wear.
⚠️ Never operate with a dirty or missing filter
Without a (clean) filter, dirty water circulates, and the pump can overheat. A saturated filter also promotes bacterial growth. Replace it in time for your pet's health.
New to a pet fountain? Then read how to accustom your cat to a pet fountain and how to clean the pet fountain step-by-step.
Frequently Asked Questions
Can I use any filter in my pet fountain?
Better not. Each model has a filter with specific dimensions and connections. A non-fitting filter will not seal properly and will filter less effectively. Choose the filter that belongs to your fountain.
How do I know which pet fountain model I have?
Check the bottom or the manual of your fountain, or compare it with the product pages. If in doubt, our team will be happy to help you.
How often should I replace the filter?
Usually every 2 to 4 weeks. Replace more often with multiple pets, hard water, or visible dirt.
Should I rinse a new filter first?
Yes, rinse a new activated carbon filter briefly under cold water before use. This washes away loose carbon particles and starts with clear water.
Written by the SmartPaw editorial team. Facts checked with veterinarians and official sources. Published on July 13, 2026, last updated on July 13, 2026. Sources: International Cat Care, SmartPaw manufacturer guidelines.
This blog is for informational purposes only and does not replace veterinary advice.
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