Recommended to buy one pack if your bubbler is a small handheld type, or if you want to use these as "terp pearls" inside a banger.
For our "High Performance Hydrator" and other small size bubblers, it takes about half a pack to fill the space just above the showerhead. Most waterpipes use anywhere from 1 to 8 packs.
Beads will improve cooling and filtering of vapor or smoke. They break up large air bubbles, greatly increasing surface area in contact with the water.
In general, fill your waterpipe with enough beads to cover the holes at the bottom of the down stem. Add water. You may add too much water and then pour it out gradually until the splash is not inhaled on a strong rip.
Each pack contains at least 100 pieces of 8mm glass beads.