Keeping this filter clean. it will assist in the overall life of this filter to approximately 12 months pending on use. there is always going to be some very very fine dust remaining in the top section of the filter this will eventually caused the filter to become slightly clogged. Pending on use it is worthwhile changing it when the filter needs to be done festival assist keeping the vacuum and good working order and also keeping your carpets and vinyl floors cleaner for longer. have purchased two new filters over eBay this style of vacuum and found the price to be very competitive especially when the prices of having is going up.