It's no secret that many cats prefer running water for drinking. Automatic water dispensers are a must for cats whose owners work long hours, to ensure fresh water at all times. These are the best, in my opinion, among those I've researched, and I personally use one of each brand for my cats. It should be noted that both brands require regular cleaning and replenishing of water.
This fountain is remarkably quiet while delivering a continuous flow of fresh water, filtered through charcoal for purity. The self-contained unit holds a 50-oz. supply of water and is attractive as well as functional. Like all automatic water dispensers, it is extremely important to regularly clean the unit, and replace the filter as directed.
The Drinkwell Pet Fountain features a flow rate control knob and reusable filter. The self-contained unit holds about six cups of water, and an optional reservoir doubles that capacity. If your cats love running water, the trickling effect will attract them.
Unlike the splash or trickling function of the Drinkwell and Petmate fountains, the Cat It Fountain delivers fresh water by flowing it over a large, clear dome, which allows several cats to drink at once. The Cat It Fountain comes with one detachable food bowl as well as the requisite water bowl. Additional food bowls are available, as well as a Cat It Mat for floor protection. Be sure to order additional filters, as they must be changed frequently. Reservoir holds 100 oz. of water.