Karcher NT 25/1 Ap 1.85 HP Wet Dry Vacuum with 5.5 gallon Dry Capacity & 3.3 gallon Wet Capacity The Karcher Promise: Cleaner. Quicker. 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!