My cats are AVID sink drinkers. Awhile ago we purchased a pet fountain but it was loud and dirty looking (the filter sat on top for all to see). The Premier Pet Fountain is AWESOME. It is SO QUIET and easy to use. The only time I ever hear it is when it runs low on water (great reminder to refill it). My 10 year old set up the unit and we just slowly pour water on top when it needs more. I have 3 cats so we have to refill every 2-3 days. Also the filter is tucked nicely INSIDE of the unit so no one can see it. GREAT FOUNTAIN! I'm very happy with it and my fur babies are very happy with it.