Very clever invention...
but not thought out very carefully,
or invented by a molecular biologist.
Water sitting will grow bacteria, in which is harmful for any pet.

Pros: .

Cons: .

While it keeps more water available, the bowl doesn't get washed daily and mold can grow.

Pros: Keeps more water available

Cons: bowl can get dirty

This is a great waterer. We use these in our cat playroom for 10 plus cats and it's a lot easier than water bowls that spill. Great product!

Pros: keeps them hydrated

Cons: none

the cats used it, but it's not easy to clean, and the plastic causes rashes on the sensitive ones if not cleaned every other day

Pros: good for the cat

Cons: hard to clean

I liked the fact that my cats always have water. The neck of the bottle gets green though and is hard to clean.

Pros: keeps water for cats at all times

Cons: Hard to clean the neck of the bottle