Pulse-Bac is the Original & Patented Self-Cleaning Vacuum. Most vacuums can lose up to 50% of their suction as the filter clogs. Not Pulse-Bac. Pulse-Bac is different, its Automatic Pulse-Clean Technology keeps filters clean and suction consistent. Plus they're 100% automatic, no heavy compressors or buttons to push. You just turn it on and go to work. Pulse-Bac's HEPA Certified Filters comply with the OSHA Silica and EPA RRP regulations. For Superior Dust Collection, Check out Pulse-Bac.