Percolators work with the bongs existing set-up to provide added filtration and cooling of the smoke. Percolator Bongs essentially add important filtration and cooling to the smoke for a more enjoyable hit. smoke and water are forced through the percolator by the negative pressure from the user inhaling on the glass bong. the percolator usually inside the main chamber or within the tube on the way to the mouthpiece. Percolator bongs usually are available in many different shapes and styles. include inline percolator bongs, dome percolator bongs, showerhead bongs, tree percolators and many other excellent designs. browse our great collection and get your best affordable percolator water bongs.