a gravity bong is a home made pipe that is designed to use the force of gravity to pull weed smoke into the chamber, usually using water as the means for drawing the smoke down into the chamber.
1.) take any plastic bottle or jug, poke some holes in the bottom of the bottle or jug,
2.) create a foil bowl to fit inside of the bottle opening,
3.) get a bucket or anything the bottle will fit inside and fill the bucket with water,
4.) put the bottle or jug inside the bucket fully submereging the bottle in the water, up to the opening of the bottle (the bucket is filled with water at this point),
5.) put the foil bowl on top (the bowl is filled with weed at this point),
6.) light the weed and draw the bottle up, watch the water pull the smoke into the bottle, make the smoke as chalky as you desire, then when the bottle is almost completly empty of water and full of smoke, take the bowl off and suck the smoke in, at the same time the bottle should start filling back up with water as you are sucking in the smoke.
then if you really want to get high use the bottle as a respirator breathing into and out of the bottle until there is no smoke left.
the gravity bong is the best way to get 4 people off their gord with only a small amount of weed because of the enormous hits this device can generate, this is by far one the more superior means of getting high off a tiny amount of weed
We made a gravity bong out of a sunny D 1 gallon jug, and a trash can.
Nobody could ever completly clear the Sunny D chamber.
My favorite gravity bong is a 2 litter and a cooking put full of water.