The Aqua Falls™ Fountain continuously circulates and filters your pets water. Fountain features a patented free-falling stream to draw more oxygen into the water and the sound of the free-falling stream lets pets know their water is fresh. A replaceable charcoal filter removes bad tastes and odors from the water. The fountain holds 50 ounces of water and is recommended for small dogs and cats. Maintaining the fountain is simple, just add water to the fountain as needed, and all the parts easily disassemble for cleaning. A low-voltage (12V) submersible pump is is safe and used for quiet operation. Fountain should be cleaned every 1 to 2 weeks and the charcoal filter should be replaced every 2 to 4 weeks. Change the filter more frequently when multiple pets are using the fountain. This product is BPA Free. Dishwasher Safe. 1-year warranty. UL listed. Imported.