I'm pretty sure this is meant more for oceans and rivers etc, not a pool. But yeah there is a CO2 cartridge. Here is a link to a video on them if you want to see it.
https://www.youtube.com/watch?v=W-8nCyXm03E
Have you ever had a near drowning experience? You need something like a life jacket that keeps your head above water, not something that will keep,your arm extended overhead while your face remains a foot or two below the surface.
https://www.youtube.com/watch?v=W-8nCyXm03E