We have the Cat-It at home, I change the filter about once every two weeks. But that's simply because our cat loves to play with her dry food, throwing it on the floor and tossing it around before eating it, so many times food gets caught in the filter, which wears out the filter faster than usual. I also clean the fountain about twice a week for the same reason.
She absolutely loves the fountain though, sometimes she'll stare at the dome for minutes, just watching the water flow.
Sometimes she'll play around a bit too much, and while petting her I'll notice that her paws and belly are all wet (from the water).
