You don’t need any of that chemical nonsense to just have fun, though, as this compressed air cannon from [OtisLiu153 ... should simply never build a PVC pipe pressure vessel at all.

[NightHawkInLight] a.k.a. [Ben] recently built an awesome high power air cannon out of PVC pipe. PVC air cannons are great, and everyone should build one of these at some point in their life ...

Parts & Tools: 1. 18" x 3" Pressure Rated PVC Pipe 2. 3" Pressure Rated PVC End Cap 3. Piezoelectric BBQ Igniter or Flint & Steel Lantern Striker (Available at hardware or sporting goods stores ...