A percolator bong is a type of water pipe that uses one or more than one perolators to filter the smoke. The water cools down and filters the smoke, which means you get a smoother hit. A percolator bong contains one(or more than one) percolator that features small holes or slits that allow air to pass through and mix with the smoke inside it. This causes turbulence, which then filters out some of the harsher chemicals in the marijuana before you inhale them into your lungs. The result is cleaner tasting smoke that has been cooled by its journey through multiple chambers within a percolator bong's design.