The percolator bong provides the smoothest, coolest blow by filtering the smoke before it reaches the lungs. The percolator bong can not only simply filter through water like normal water, but also add an additive called percolator or "percs" to spread the smoke into hundreds of tiny bubbles. These bubbles greatly increase the surface area of the flue gas that travels in the flue gas, giving it more time to cool and filter out impurities. The result is a cleaner, healthier with the difference you can taste.