How much should you put in a bong?
- How much should you put in a bong?
The simple answer to how much bong water you need is just enough to ensure your downstem is submerged by about a 1/2inch (1 - 1.5cm). If your pipe has a diffused downstem (a downstem with slits in it to aerate the smoke), then you want the water level to be high enough that all those slits are submerged.