Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: filters DO NOT last 5 years

I bought two of these units in November 2010. In July 2011 both units began to emit a strong chemical odor. I contacted customer support and was told that I needed to replace the filters. I explained that the cleaners were not even a year old and the representative said it could happen and that the 5 year life for the filters depended on how hard they had to work. I have my house cleaned every 2 weeks and dust is not a problem. I do have a cat (part of the reason for purchasing these) but only 1 cat, not several. I think it is also very suspicious that the filters began to "fail" at the very same time. These units are not cheap and neither are the filters. Having to replace the filters, even at a pro-rated discount is too costly. I ended up spending another $250 for 2 new filters after less than a year. Do not be fooled by the 5 year filter claim. It is false advertising as far as I am concerned. I will not be doing business with this company again.