The reverse pulse jet method used in dust collectors is a very common cleaning method. It is designed to extend the life of the filter in the dust collector. The reverse pulse jet is semi effective at doing this job, however over time the debris build is more than the pulse can handle. The cleaning process I am talking about is the Sonic Dry Clean Process, it is a cleaning process that takes place outside the dust collector after the filter has become plugged. The Sonic Dry Clean Process uses computerized sequences of compressed air, vacuum, vibration and rotation to completely clean a dirty cartridge filter in less than five minutes. The cleaning process does not harm the filter in any way and allows the operator to safely clean and reuse his cartridge filters. Generally a good quallity spun bond filter can be cleaned twice as much as a standard paper cartridge. Let me know if you want any addtional information on this process or have any specific questions. ■