This 15" tall dude is a great buy. The button-style diffusers in the bottom perc chamber is very unique. It is not a very common style of diffusion but works very well. Many of our customers call it the racecar perc. Mainly because the little button filters resemble racecar wheels as well. The secondary chamber is not actually for water filtration. It breaks up the smoke to cool the airflow without using water. This is the perfect-sized water pipe to add an ash catcher.