zooplus Basics Drinking Fountain Filter

The filters work better than the original Catit filters because they have more "filling". My cat drank as usual, BUT! – one of my tomcats stopped drinking from the fountain completely. It took me a while to notice and figure out what the problem could be. When I put the original Catit filter back in the fountain (and changed the water), the tomcat started drinking almost immediately. So I recommend owners try it out and watch for any changes in their cats' behaviour. I’ve no idea what bothered the tomcat, but for me, it’s a raised warning finger.