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An ash catcher is a water filtration device which works almost identically to a bong. In an ash catcher, a series of glass tubes draw smoke from a bowl and pass it through a chamber filled with water.
Attaching to a front of a bong, an ash catcher (also sometimes referred to as a pre-cooler) acts as a sort of “bong within a bong.”
By performing a step of water filtration before the smoke enters your bong proper, the ash catcher effectively removes any ash, particulates, and most of the tar and resin that would otherwise accumulate in your bong.
The result of adding this extra filtration? A smoother hit and a cleaner bong.