I received the vacuum cleaner in October 2105. The original filter lasted over a year. I clean the vacuum and filter (by shaking and brushing with a brush) every few days and the filter with an air compressor about once a week. I received this replacement filter in December. 7, 2016. For 3 weeks, the vacuum cleaner spat out fine dust and filled the room. I think this filter is defective because the original lasted about 14 months.