The Karcher NT 25/1 Professional wet/dry vac offers a Professional level performance in a compact, easy to transport frame. Semi-automatic filter cleaning system: clean the filter with the simple push of a button. Significantly reduces the downtime required for filter cleanings and also increases the life of the filter by up to 3X. Compact Flat Pleated Filter: Resides completely outside the tank, thereby maximizing tank capacity. Typical filters occupy tank space, reducing the useable tank capacity by up to 25%; not the Karcher NT filters. Remove/replace the filter without opening the tank, avoiding the usual mess created by filter cleanings. Certified HEPA-Ready: combine with the optional HEPA filter to use in medical, industrial and other demanding settings. Superior air flow of 71 liters/second (18.7 Gal./second) Designed for both coarse and fine dust, as well as wet suction.