Patent ID: 7722699

Claim:
A dual-directional, pressure differential apparatus comprising: a container; a reservoir; at least two solenoid valves to release controlled bursts of air into a top of the container; wherein a rate of the controlled bursts of air are at least partially responsive to a pressure differential between atmospheric pressure and that of compressed air in the reservoir; a pleated filter fitted inside of the container, the pleated filter having an inner wall and an outer wall and outer tips; hot melt glue beads separate pleatings within the pleated filter; wherein the hot glue beads fill approximately three-fourths of a depth of a pleat from the inner wall to the outer wall to provide increased surface area; and a blower; wherein the controlled bursts of air are programmed to be substantially automatically responsive to a first pressure differential between the inner wall and the outer wall to draw air through the pleated filter from the inner wall to the outer wall until a second pressure differential is achieved; and wherein the controlled bursts of air are programmed to be substantially automatically responsive to a second pressure differential between the inner wall and the outer wall to draw air through the pleated filter from the outer wall into the inner wall and to draw upwardly out of the top of the container until a first pressure differential is achieved.