Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disgusting!

I have been using the ScoopFree Litterbox for over 8 months now, and it is the most disgusting pan I have every owned. I replace the cartridges every week, even though they supposedly last for a month, and it still stinks up the entire second floor of my house. The crystals do not work nearly as well as they should. They soak up the urine but just stay drenched and smelly. It doesn't even get a chance to work on the poop, as it's pushed under the lid after 20 minutes. This things is going in the dumpster. What a wast of money! Some things really are too good to be true... (sigh...)