I bought this filter to replace a normal bissel vacuum cleaner. After a few months of use, you can see the HEPA filter turning from white to gray as it is clogged and needs to be replaced. I could find it at Home Depot or Lowes. It's the kind of replacement item that stores like Lowes or HD keep in stock for a while without much enthusiasm. It is not discounted or advertised as with larger purchases. Revain will get you the parts you need without wasting gas and time searching. And at a lower price. This seems to work fine and appears to be a genuine article.