Instruct: Classify the given review into positive or negative sentiment.
Query: Drinkwell Platinum Pet Fountain

The fountain is well liked by my two cats. One of my cats in particular, would only drink from the bathroom sink. The water is not filtered and has a lot of chlorine in it. I wanted a more convienient and healthy alternative. She, as did my other cat, loved it right away. The only negative has been that it is made of plastic. I wish is was made of a more healthy drinking material. You will have to wash it at least once per week ( the whole thing). I myself, have found it best to thoroughly clean it every 4 days.