Originally Posted by Hajo Flettner
Personally I don't like ungazed bowls because they tend to be harder to clean and more fragile then glazed bowls. Also, for tombac the type of bowls mentioned are not that great in my opinion since the bottoms are not flat which makes packing more difficult. Further more, the single large hole means that a great deal of care needs to be used when shredding the tombac to assure the pieces are long enough that they don't fall in or other wise clog the holes.
There is a small brass screen that covers the hole that the traditional smokers use or if that is not available they fit a pebble in the hole that allows smoke to pass that stops the tombac from falling down the hole and blocking the stem of the hookah