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Title: Not reliable.
Review: My first machine did not last a year and was very noisy with a loud clicking sound. I also found the filter dirty very quickly-and the motor is not enough power for a large space. I ended up returning one only to find that the next one arrived damaged. Finally on the third replacement I gave up and ordered a different model, which has just recently been sent back again. Whether it is this model or damage in shipping, the replacement of this purifier has turned out to be more trouble than it's worth. I like the company and continue to order products from them, but I would not recommend this product. I would also not recommend a permanent filter which always seems dirty even when vacuumed. Pay the extra money for a replaceable Hepa type filter-purifier-it is well worth it!
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