Developed by a Veterinarian, the DrinkwellOriginal Pet Fountain provides 1.5 L of fresh, filtered water to your pet. A patented free-falling stream of water entices your pet to drink more and continually aerates the water with healthful oxygen. A charcoal filter removes bad tastes and odors, giving your pet the best way to stay hydrated!Why running water is essential to better pet health...In nature, moving water is much fresher than stagnant water. The movement constantly breaks the surface tension of the water and draws oxygen from the air into the water. This process is called aeration and it makes the water more appealing to drink. Pets may be drawn by instinct to moving water for this reason.Researchshows that one of the best ways to improve your pet's health is to get them to drink more water, and the best way to do that is with the DrinkwellOriginal Pet Fountain. The Pet Fountain filters and aerates continuously moving water to keep it much fresher than standing bowl water. In addition, the constant circulation inhibits bacteria growth keeping the pet fountain cleaner.The features are summarised as below:Free-falling stream encourages pets to drink more waterAdjustable flow controlReceiving ramp reduces splash of falling waterConstant water circulation inhibits bacteria growth in between cleaningsReplaceable Charcoal Filter removes bad tastes and odoursPre-Filter catches hair, debris andpet foodleft in the waterSubmersible pumpfor quiet operationDishwasher safe (excluding Pump)