Filtering thebad stuffout of smoke is all about maximizing the amount of time your smoke interacts with water molecules.
The more time smoke interacts with water + more bubbles = healthier hit. #Science.
The Bong filters smoke through an Inline perc and then a Sprinkler perc before entering the glycerin chamber. Each percolator creates more surface area for the water to interact with the smoke, thus maximizing the filtration and natural cooling effect that water provides. The glycerin chamber provides an extreme cooling effect resulting in an astonishingly smooth, flavor-packed and ice cold hit.
Freeze Pipe Bong vs The Freeze Pipe Bong XL
Both are great pieces and provide monster rips without the chest or throat burn. The difference is the Bong XL has two percolators (Inline perc and a sprinkler perc) for maximum water filtration while the regular bong has one downstem perc. The Bong XL has a 50% larger glycerin chamber.