Perfect for demonstrations in which using an actual cigarette is impractical or is not permitted * The user starts pumping clean water through the Tarminator filter unit, demonstrating how unpolluted air leaves no deposits on the lungs * For comparison, a special mixture is then pumped through the unit, staining the Tarminator filter a dull brown * This shows how lung tissue absorbs the tiny particles in cigarette smoke * After the demonstration, the stained filter can be passed around for closer examination * Includes: 50 filters, tar mixture and instructions