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The
gravity bong is an unfiltered lungful. Grab a big bottle, like a 1litre/2litre
bottle. Hold it upright (bottle neck on top) and make a hole, as wide
as a biro-pen, just on the bottom edge of the bottle. Put the bottle
aside and make or affix a pre-made 'cone' with 'mix' onto the top of
the bottle. Be sure that the 'cone' will make an air-tight seal around
the opening.

Fill the bottle with water and place a finger over the hole you made
in the bottom, to prevent the water emptying too soon.
Put the 'mix cone' on the mouth piece of the bottle and apply a flame
to the mix. Then remove your finger from the hole at the bottom of the
bottle (keep the flame applied to the 'mix' until, either the mix has
burnt through or there is no more suction), and let the water pour out
(over a sink or something). You'll notice that, as the water flows out
of the bottle, the smoke produced from burning the mix, is drawn into
the bottle-chamber. Once all the water has emptied the bottle, quickly
remove the 'mix cone' and inhale the smoke inside the bottle-chamber.
Voila!
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