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Why Your Cat's Water Fountain Gets Slimy and How to Fix It?

Oct 12,2023 | petwant


Cats are known for their discerning tastes, and many pet owners have opted for cat water fountains to provide their feline friends with a constant flow of fresh water. However, a common challenge faced by cat owners is the development of slimy residue in the water fountain. 
Addressing these issues and implementing proper cleaning practices can help keep the fountain clean and hygienic for your cat.

Here are some common reasons why your cat's water fountain may be getting slimy:

1.Biofilm Formation:

Explanation: Biofilm is a thin layer of microorganisms that can develop on wet surfaces. In the case of a water fountain, biofilm can form on the interior surfaces, resulting in a slimy texture.
Solution: Regular cleaning is essential to prevent the buildup of biofilm. Disassemble the fountain and clean all components thoroughly.

2.Inadequate Cleaning Practices:

Explanation: If the water fountain is not cleaned regularly, biofilm, algae, and other contaminants can accumulate, leading to sliminess.
Solution: Establish a consistent cleaning routine. Clean the fountain at least once a week, ensuring that all parts are thoroughly scrubbed and rinsed.

3.Water Quality Issues:

Explanation: The mineral content in tap water can contribute to the formation of slimy deposits over time.
Solution: Consider using filtered water or distilled water in the fountain to reduce mineral buildup. Regularly change the water to prevent the accumulation of minerals.

4.Use of Inappropriate Cleaning Agents:

Explanation: Using regular soap or harsh cleaning agents can leave residues that contribute to sliminess.
Solution: Use pet-safe cleaning agents, such as white vinegar or specialized fountain cleaners. Thoroughly rinse all components after cleaning to remove any cleaning product residues.

5.Insufficient Drying:

Explanation: If the fountain is not completely dry between cleaning and refilling, it creates a damp environment conducive to mold and slime growth.
Solution: Ensure all components are thoroughly dried before reassembling the fountain. Consider leaving the fountain disassembled for a short period to air-dry completely.

6.Water Fountain Design:

Explanation: Some water fountains may have design flaws that make them difficult to clean effectively, leading to persistent sliminess.
Solution: Consider upgrading to a water fountain with a design that is easy to disassemble and clean. Read product reviews to find fountains that are known for being easy to maintain.

7.Temperature and Environment:

Explanation: Warm and humid environments can promote the growth of microorganisms and contribute to slimy deposits.
Solution: Place the water fountain in a cool, well-ventilated area. Regularly monitor the surrounding environment for factors that may contribute to mold and slime growth.


Q: How often should I clean my cat's water fountain?
A: Regular cleaning, ideally once a week, is crucial to prevent the accumulation of biofilm and slime.

Q: Can I use regular soap to clean the water fountain?
A: It's recommended to use a pet-safe, non-toxic cleaner or white vinegar to clean the fountain. Regular soap may leave residues harmful to your cat.

Q: Is the slimy residue harmful to my cat?
A: While the slime itself might not be harmful, it can harbor bacteria. Regular cleaning ensures your cat has access to clean and safe water.


Maintaining a clean and slime-free pet water dispenser is essential to ensure your cat stays hydrated and healthy. By understanding the causes of slimy residue and implementing regular cleaning practices, you can provide your feline companion with a constant supply of fresh, inviting water. Remember, a little proactive care goes a long way in keeping your cat's water bowl a source of refreshment, not a slimy surprise.