Re: Does it really work? (a discussion of all hookah techniques, topic changes)
While i have not yet made a diffuser i have a really good idea on how i would/will make one.
You could buy plastic tubing and fill the bottom with hot glue. Drill holes around it then push it up inside the barrel. If you think that would decrease the diameter too much then use fish tank tubing instead.
Just dip it in hot water for a few mins. thenpush it up over the down spout. Should work nicely.