The filter fountain works pretty well. however I did not realize it was for smaller dogs, I have a German Shepherd, Golden Retriever and a Labrador Retriever.  Only the Golden likes to drink from the fountain.  So now i have a fountain and a bowl of still water.  I do have to dismantle and clean the fountain about twice a week, it is easy to add water in between cleanings.  I have tried the single spout to see if the other 2 will drink from it, but they still are not interested and the single spout is pretty noisy also.