Older technologies included vibration, shaking and even banging to dislodge accumulated dust from the filters. Most modern systems use air blown through the filters in the reverse direction of the normal airflow through the collector as it's collecting dust. This more efficiently dislodges dust from within the pleated media pack. Not all filters in the collector are reverse blown at the same time. This allows the dust collector to continue to run, doing its job of collecting dust while cleaning of the filters can occur at a continuous or intermittent interval.
In most cases, this reverse air is pulsed (a short blast like 0.15 second). Here is a video demonstrating the reverse pulse cleaning of filter cartridges inside a dust collector. (The filter access door, normally closed, was left open for this demonstration.)
Learn more here about efficient pulse cleaning inside a cartridge dust collector . Refer to figure 6 and the article text around it.
