Bag vacuum cleaner is Separation of garbage and gas by the high-speed rotating vacuum airflow of the motor, going through to HEPA filter and purifying air, So as not to cause secondary pollution, the trash will stay inside the filter bag. 99.99% of particles below 0.3 microns in size can be filtered out, there is no need to change filter bag frequently, and easy to clean the filter bag, no need to wash filter bag everyday. But after a long time, the filtering effect of the dust bag has decreased, needs to change it. Our company bag filter vacuum cleaner with High-efficiency dust bag and a washable filter bag are economical.