How to change the filter in a wet/dry vac Believe it or not—your wet/dry vac filters serve a greater purpose than you might think. Without filters, the dust-particles and dirt in our home or construction site can quickly infiltrate the air we are breathing instead of staying secure in your Vacmaster—causing allergies and dirty messes that you were intending to clean up. But when to make a replacement depends on how often you use your vac and what you pick-up with it. The