Why Is My Cat Water Fountain Slimy? Preventing Biofilm

That slippery coating inside a fountain is biofilm — and while it’s normal, keeping on top of it matters for hygiene and appeal.
What biofilm is
Biofilm is a thin layer that naturally develops wherever water sits, made of microbes and organic residue. It feels slimy and can carry an odour if left.
Why it matters
Cats can be put off by a slimy, smelly fountain, and biofilm gives bacteria somewhere to settle. Removing it keeps water inviting and the fountain hygienic.
How to remove it
A soft brush and warm water lift most biofilm — get into corners, channels and the pump area where it hides. A dedicated fountain brush makes the crevices easier.
Preventing its return
The weekly clean is your best defence, along with fresh water and regular filter changes. Stay consistent and biofilm never gets a foothold.
SHAEVRA Flow is a cordless cat water fountain with a rechargeable battery, a motion-sensing pump and a stainless-steel drinking tray — made to sit anywhere in an Australian home.
Fresh filters are part of keeping the water clear.