I have a decorative "rock" fountain that my friend gave me last year for Christmas. The cats seem to think that it's their own personal drinking fountain. So, I keep it near their water dish and use filtered water. The only problem now is it's developed a leak somewhere so I have to keep adding filtered water to it. I might just break down and get a drinkwell fountain with the reservoir. I tried a cheaper brand from one of those "gadget" catalogs and got what I paid for. Live and learn.