It is amazing how replacing filters brings the Shark NV500 back to life. Our vacuum was getting a little weak, I was thinking that we might need to buy another machine. A friend reminded me that replacing filters would allow the air to flow properly, and boy was he right! Our Shark is working just like new! The company recommends replacing the foam filter every 3 months and the HEPA filter annually. Of course, out of sight - out of mind, which is a mistake. And it's so easy, even non-technical people like me can replace the filters in less than a minute. Do yourself a favor and buy replacement filters before you need them. You will be glad you did.
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