Hi guys, Just wanting to know what you guys think about this bong! "Black Leaf Bio-Haze. Large pyrex glass bong with reinforced down-pipe, mount and bowl. Product Details: Ice Water Pipe H 370mm Ã˜ 55mm SG 2x18 WT 3.2mm Nice capacity bubble, solid feel bong with shotty." I am adding a carbon filter to it just to get extra filtering before it hits the water. Is the carbon filter able to be added? I don't know much about the whole SG or whatever thing, it's my first bong that isn't a crappy acylic with gromets! Peace.