Well I just broke down and decided to buy one of these pet fountain filters. I was going to buy the same kind that Sas has but then I saw another kind and it was the last one. The name of it is Drinkwell Pet Fountain. I also bought the refill accessory for it so it can hold up to 12 cups of water. I bought it at Petco and they said that they tend to sell more of these than the other kind. I'm also going to buy a cord conduit which is a hard plastic protector so this will help protect the power cord. The cats seem to really like it and seem more curious than scared of it. I'll still keep their old water dish out for a while until they get more used to it. They are very spoiled cats but they should be because they are my children.