Description from the vendor website:

Cats love running water because their instinct tells them that running water is CLEAN WATER! We brush our teeth daily. How many of us even try to brush our cat's teeth? How easy would it be if cats could clean their teeth simply by drinking water?

Features:

• Surface skimmer: aerates water and ensures a crystal clear drinking surface is free from saliva and slime.
• When it comes to fountain pumps, SIZE does matter! Cat H2O & Dog H2O uses an OVERSIZE quality aquarium pump with a market-leading flow rate of 160~200L/hr, ensuring strong filtration. 
  Pump failure is the #1 issue for pet fountains. BIGGER - BETTER - GUARANTEED.
• Dishwasher friendly, disassembles in seconds without tools or any sharp edges.
• Food-grade & BPA-free housings ensure pure water.