All the gravity bongs I've ever done ripped my throat apart but laid me out. Mostly, I've done the gallon, 1 and 2 liter Gravity Bongs, but with a rare occurence. The water medium for the gallon was a salad bowl and for the 1 and 2 liters were in pitchers. Next time I end up doing it, I'm loading the water with ice to hopefully ward off the scratchy throat issue. Screw tops are annoying, aren't they?