Instruct: Classify an Amazon review as either positive or negative.
Query: Keeps the cats hydrated

It does work. Before, the only way my cats would drink water was when I turned on the bathroom faucet. They didn't care for the water bowl because it loses oxygen or something like that. It was pretty annoying and I would worry they would get dehydrated if I wasn't home. But after I got the drinking fountain, I see them drinking from it through out the day. They sometimes even played with the flowing water.Although you can hear the water flowing, it doesn't bother me at all. It sounds like one of those therapeutic fountains. The only time it makes an annoying noise is when the water is running out, which is good because it acts as a reminder to refill the reservoir.The only thing that's a pain is washing it. It's not as simple as washing a bowl, just because the electric cord is attached to the fountain (of course).