Originally Posted by madavis25
Marbles are to weight down the whole hop cones and get them in more contact with the beer, otherwise they would just float.
Unfortunately, I didn't use enough marbles and half the bag is above the water (beer) line. So, I guess I'm only dry hopping with half an ounce instead of an ounce of Amarillo. Oh well, maybe it happened for a reason (staying positive).