We have the basic Drinkwell fountain and I take it apart and clean it weekly, as it recommends in the unit directions. I change the filter as needed, and rinse it weekly.My cat loves her fountain. She was never a fan of still water, so I was worried that she wasn’t getting enough. She now loves to drink moving water, and also just sits at it a lot and stares at it obsessively. I rinse it out about every week, and do a full clean and very 2 weeks, and that seems to keep it in good condition. You have to rinse it because the bottom will get a film if you go any more than a week.