It seems multipe chamber bubblers add additional filtration. Why don't we get the same filtration from a bong that holds more water? It seems if you had a bong that held as much water as a 3 chamber bubbler you should be able to get the same filtration. Is there something that happens when the smoke goes in the water, comes out and goes in again? You get better hits from bongs when you don't fill them to the brim, why is this? Also, what gets you higher, a bubbler with a bunch of chambers or a decently sized bong?