ae n1 thredi, lolol skunka u call this a gravity bong ?? this looks to me like a good old bucket bong! nice..have not done for long time although what u go in the lid there ? I normaly put a cone/bowl piece in the lid and do it that way.
what I could call a gravity bong is similar but no bucket,
cone/bowl piece in the lid but this time the bottle is full of water and a small hole in bottom drains out creating suction and pulls the cone.
i just use a glass bong and keep cleaning it, but you guys should make sure to put in bottles recycle when finished and pour that sheety water out no where near where you stay at, because that sheet stanks.