I feel like I have to have these. I can't drink the water out of my faucet, so I don't want my dog to either. This makes me feel much better about what was going into his body.

Pros: Cleans the water

Cons: none

These last a decent amount of time and they help keep the water filtered. We tend to keep a few packages on hand because they can be hard to find at times.

Pros: Clean water

Cons: !

I have 2 of these waterers for my 7 cats so I keep a supply of filters on hand. It keeps my cats out of the sink!

Pros: easy to change

Cons: none

My cats seem to drink more water since I got the fresh flow fountain. I guess these filters make the water taste better.

Pros: Does a great job

Cons: None

Seems to do its job. My cats like the flowing water.

Pros: filters water

Cons: none