Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Effective, but short-lived

This is the right filter for my Sears/Kenmore refrigerator, at a much better price than you could find in the stores. It is very effective, and the water tastes considerably better after I finally remember to re-order and replace the old one. I do wish they lasted longer, but being able to buy two at a time helps to at least have one on hand when they do expire.